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(完整word)解方程专项练习200题(有答案)ok
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解方程专项练习----
解方程专项练习200题(有答案)
(1)x﹣=,
(2) x××=,
(3) ﹣4x=,
(4) 8×2.5﹣2x=13。6
(5) 0。78:x=3:5,
(6)1﹣20%x=0。4,
(8) 1÷(x﹣)=6,
(9)2x﹣x=1。2,
(10)9×3﹣1。7x=13。4,
(11)x﹣25%x=24,
(12)x﹣+0。2=,
(13)0.6x+90%x=78,
(14)20%x﹣2。4×3=0。8,
(15)x﹣x=42,
(16)0.6x+3×2.5=67。5,
(17)1÷(x﹣0。45)=5,
(18)x﹣2。25=8。25,
(19):x=3:12,
(20)x+0。8=5.6,
(21) 1。4:x=1:0。75,
(22) x×(2﹣)=24,
(23) 4x﹣=3,
(24)12x+7×0。3=20.1,
(25)x+x=,
(26)x:42=,
(27)×0。5+x=,
(28)0。8:=0.48:x,
(29)χ﹣χ=,
(30)42:=χ:
(31)5x﹣0。4=75%,
( 32) 6x﹣0。9=4。5,
(33)2(x﹣3)=5。8,
(34) 1。6x=6。4,
(35) 4x﹣3×9=29,
(36)16+8x=40,
(37) x÷1.1=3,
(38)+2x=,
(39)×3﹣7x=1。04,
(40)x﹣1﹣x=2,
(41)x﹣x=14,
(42)3x﹣x=,
(43)=,
(44)1。2:=,
(45)=:,
(46):=x:0。8,
(47)x=+1,
(48)1﹣25%X+25%x=+25%x,
(49)=,
(50)×X=,
(51) 5:8=x:32,
(52)2x+3×0。9=24.9,
(53)5。3x﹣2。9x=,
(54)×(7﹣2。8x)=1.5,
(55)x:0.3=:,
(56)
150%x+66=99
(57)x+6﹣0.8x=16
(58)
(59)
(60)3÷(X﹣)=1。3
(61)(X+0.5):2=(X﹣4):,
(62) X÷0。05=3.528,
(63)2X﹣4×6=80,
(64)4×4.5﹣3X=6.38,
(65)4X﹣7.2=10,
(66)11.5X+X=20,
(67)3。8×12+15X=87。6,
(68)6X+5=17,
(69)0。6×(2.5+X)=4。2,
(70):=X:,
(71),
(72)
(73),
(74)4(+x)=,
(75)×0。25+x=,
(76)x﹣,
(77)200:6=x:,
(78)4÷X=,
(79)8(x﹣2)=2(x+7),
(80):18%=,
(81)﹣2x=,
(82)x+x=46,
(83):x=:,
(84)=,
(85)5(3x﹣4)﹣2(x﹣1)=5(2x﹣1)
(86)=,
(87)8(2X﹣7)=5(X+13),
(88)3(x+4.5)=60,
(89)1.6x+2.4=7.52,
(90)3(x﹣0。8)=6。3,
(91)28.4﹣5x=5.8,
(92)x:=
(93)+2x=,
(94)x=15%,
(95)x﹣x=,
(96)x+50%x=6,
(97):x=0。3:12,
(98)4x+2(8﹣x)=26,
(99)x﹣=0,
(100)+x=1,
(101)x×(+)=,
(102),
(103),
(104)x﹣,
(105)x×,
(106)5x+35=650,
(107)720÷3x=80,
(108)3。6x﹣0.9x=8.1,
(109)4×4。5﹣3x=6,
(110)=,
(111)6×3﹣1。8X=7.2,
(112)÷x=,
(113)x÷=42,
(114)x+=,
(115)7x÷3=8。19,
(116)12:0。6=x:,
(117)3(x+2)=4(x+1),
(118)3x﹣70%x=9.2,
(119) 6+x=240,
(120)22。5﹣0。4x=12.5,
(121)x:3.5=4:2,
(122)x﹣0.8x﹣6=16,
(123):=x:8,
(124),
(125)x:15=:,
(126)x+x=,
(127)x×50%﹣x=5,
(128)1﹣x=,
(129)2。5+1x=3,
(130)3x﹣2=4,
(131)8。5﹣3x=2,
(132)3÷x=4,
(133)x﹣5%=17。54,
(134):=:(4﹣x),
(135) 6x+31=49,
(136) 7x÷3=8.19,
(137) 32.8﹣9x=17。5,
(138) x﹣0。36x=16,
(139) 6×7+3x=69,
(140) 6x+2x﹣56=0,
(141) 3x﹣0.45×4=2.7,
(142) 5.8x﹣4.6x=0。96,
(143) 8.4÷(9﹣x)=3,
(144) 3x÷1.2=8,
(145)5x+28=71,
(146)8.7﹣1。2x=3.9,
(147)8x﹣2.6x=37.8,
(148)0。75x﹣0。95×4=8。5,
(149)54÷2+3x=72,
(150)8x﹣2.6=37。8,
(151)x÷=,
(152)x+30%x=26,
(153) 7.8﹣3x=3.6,
(154) 6×3﹣1。8x=7。2,
(155)10:x=4.5:0.8,
(156):=x:,
(157)X﹣7.65=4.64,
(158)28。25﹣X=8。25,
(159)X﹣(3.6+2。97)=12.42,
(160)÷x=,
(161)14。5=5.5,
(162)x﹣80%x=48,
(163)75%x﹣5×=6,
(164)x﹣6.8=15。4,
(165)1。9x=5。7,
(166)4.3y﹣y=4.6,
(167)5x+2.6=7。6,
(168) x﹣1。5=12。9,
(169) 9x+5x=8。4,
(170) 6。8+3。2x=14。8,
(171)5÷x=,
(172)﹣x=,
(173)4。5×﹣3x=1.5,
(174)(1+25%)x=0.5,
(175)x﹣40%x=9,
(176)x×20%=15.2,
(178)x﹣x=,
(179)x÷75%=3,
(180)4x﹣,
(181):x=:4。5,
(182)(x﹣4.5)×6=12。5,
(183)27﹣17x=13。4,
(184)9。6+3x=3.24×5,
(185)2x+5=5x﹣7,
(186) 3(x﹣2)=2﹣5(x﹣2),
(187)4x﹣3(20﹣x)+4=0,
(188)﹣=1,
(189)4x﹣5×6=12,
(190)8x﹣3x=15.6,
(191)30×(x÷4)=60,
(192)7.2×0.5﹣3x=1.2,
(193)5x﹣2.4×5=8,
(194)+x=×2,
(195)5x+2.4×15=66,
(196)3.2x+2.8x—x=1,
(197)2.5×16—8x=12,
(198)9。6-3x=6。3,
(199)5(x+6)=75,
(200)x÷0。7+0.9×3=4,
答案:
(1)x﹣=,
=,
,
x=;
(2) x××=,
x=,
x×21=×21,
x=12;
(3) ﹣4x=,
﹣4x+4x=+4x,
=+4x,
÷4=4x÷4,
x=.
(4) 8×2.5﹣2x=13.6
20﹣2x=13。6,
13.6+2X=20,
2X=6.4,
x=3.2;
(5) 0。78:x=3:5,
3x=0。78×5,
3x=3。9,
x=1。3
(6)1﹣20%x=0.4,
1﹣20%x+20%x=0。4+20%x,
0。4+20%x=1,
0.4+20%x﹣0.4=1﹣0.4,
20%x=0.6,
20%x×=0。6×,
x=3;
(8) 1÷(x﹣)=6,
1÷(x﹣)×(x﹣)=6×(x﹣),
1=6×(x﹣),
6x﹣6×=1,
6x﹣3=1,
6x=4,
6x÷6=4÷6,
x=
(9)2x﹣x=1。2,
x(2﹣)=1.2,
x=1。2,
x÷=1.2÷,
x=1;
(10)9×3﹣1。7x=13.4,
27﹣1.7x=13.4,
27﹣1.7x+1.7x=13。4+1.7x,
13.4+1。7x=27,
13。4+1.7x﹣13。4=27﹣13。4,
1.7x=13。6,
1.7x÷1.7=13.6÷1。7,
x=8
(11)x﹣25%x=24,
75%x=24,
75%x÷75%=24÷75%,
x=32;
(12)x﹣+0。2=,
x﹣0.6=,
x﹣0。6+0.6=+0.6,
x=,
x÷=÷,
x=1
(13)0.6x+90%x=78,
1.5x=78,
1.5x÷1。5=78÷1.5,
x=52;
(14)20%x﹣2。4×3=0.8,
20%x﹣7.2=0.8,
20%x﹣7。2+7.2=0。8+7。2,
20%x÷20%=8÷20%,
x=40;
(15)x﹣x=42,
x=42,
x÷=42÷,
x=252
(16)0.6x+3×2.5=67.5,
0。6x+7。5=67。5,
0。6x+7。5﹣7。5=67。5﹣7.5,
0.6x=60,
0。6x÷0.6=60÷0.6,
x=100;
(17)1÷(x﹣0。45)=5,
÷(x﹣0。45)×(x﹣0。45)=(x﹣0。45),
x﹣2。4=1。6,
x﹣2。4+2.4=1.6+2。4,
x=4,
x÷=4÷,
x=
(18)x﹣2。25=8.25,
x﹣2.25+2。25=8。25+2.25,
x=10.5;
(19):x=3:12,
3x=×12,
3x÷3=9÷3,
x=3
(20)x+0。8=5。6,
x+0.8﹣0.8=5.6﹣0.8,
x=4.8,
x×=4。8×,
x=8.
(21) 1.4:x=1:0.75,
x=1.4×0.75,
x=1。05
(22) x×(2﹣)=24,
x×=24,
x×÷=24÷,
x=20;
(23) 4x﹣=3,
4x﹣+=3+,
4x=4,
4x÷4=4÷4,
x=1
(24)12x+7×0。3=20。1,
12x+2。1=20。1,
12x+2.1﹣2.1=20。1﹣2.1,
12x÷12=18÷12,
x=1。5;
(25)x+x=,
x=,
x×,
x=;
(26)x:42=,
10x=42×,
10x÷10=30÷10,
x=3
(27)×0。5+x=,
0。75+x=3.75,
0.75+x﹣0。75=3.75﹣0。75,
x=3,
x÷=3÷,
x=6;
(28)0。8:=0.48:x,
0。8x=×0。48,
0。8x=0.2,
0.8x÷0。8=0.2÷0。8,
x=
(29)χ﹣χ=,
x=,
x=,
x=3;
(30)42:=χ:
x=42×,
x=30,
x=50;
(31)5x﹣0。4=75%,
5x﹣0。4+0.4=75%+0.4,
5x÷5=1.15÷5,
x=0.23
( 32) 6x﹣0.9=4。5,
6x﹣0.9+0。9=4.5+0.9,
6x=5。4,
6x÷6=5。4÷6,
x=0。9;
(33)2(x﹣3)=5。8,
2(x﹣3)÷2=5.8÷2
x﹣3=2.9,
x﹣3+3=2。9+3,
x=5。9;
(34) 1。6x=6.4,
1。6x÷1。6=6.4÷1。6,
x=4;
(35) 4x﹣3×9=29,
4x﹣27=29,
4x﹣27+27=29+27,
4x=56,
4x÷4=56÷4,
x=14;
(36)16+8x=40,
16+8x﹣16=40﹣16,
8x=24,
8x÷8=24÷8,
x=3;
(37) x÷1。1=3,
x÷1.1×1.1=3×1。1,
x=3.3
(38)+2x=,
+2x=,
2x=,
2x÷2=÷2,
x=;
(39)×3﹣7x=1。04,
2.16﹣7x=1。04,
2。16﹣7x﹣1。04=1.04﹣1.04,
1。12﹣7x=0,
7x÷7=1.12÷7,
x=0.16;
(40)x﹣1﹣x=2,
x﹣1=2,
x﹣1+1=2+1,
x=3,
x=3,
x=18;
(41)x﹣x=14,
x=14,
x=14,
x=18;
(42)3x﹣x=,
x=,
x=,
x=;
(43)=,
2.4x=72×0.26,
2.4x=18。72,
2。4x÷2.4=18。72÷2.4,
x=7.8;
(44)1.2:=,
x=1.2×5,
x=6,
x=6,
x=9;
(45)=:,
x=18×,
x=,
x=,
x=12;
(46):=x:0.8,
x=×0。8,
x=0.04,
x=0。2;
(47)x=+1,
x×=×,
x=1
(48)
1﹣25%X+25%x=+25%x,
0.25x+0.25﹣0.25=1﹣0.25,
0。25x=0。75,
x=3;
(49)=,
0。25x=1。25×1.6,
0.25x÷0.25=1。25×1.6÷0。25,
x=8;
(50)×X=,
×X÷=,
x=;
(51) 5:8=x:32,
8x=5×32,
8x÷8=5×32÷8,
x=20
(52)2x+3×0。9=24.9,
2x+2.7=24.9,
2x+2.7﹣2。7=24.9﹣2.7,
2x÷2=22。2÷2,
x=11。1;
(53)5。3x﹣2。9x=,
2.4x=,
2。4x÷2.4=÷2.4,
x=;
(54)×(7﹣2。8x)=1。5,
×(7﹣2.8x)=1。5,
7﹣2。8x=2.1,
7﹣2.8x+2.8x=2。1+2。8x,
7﹣2。1=2.1+2。8x﹣2。1,
4。9÷2.8=2.8x÷2.8,
x=1.75;
(55)x:0.3=:,
x=0。3×,
x=,
x=
(56)
150%x+66=99
1。5x+66=99
1。5x=33
x=22
(57)x+6﹣0.8x=16
0。2x+6=16
0.2x=10
x=50
(58)
x=14.4
(59)
0.55x=5.5
x=10
(60)3÷(X﹣)=1。3
3÷(X﹣)×(x﹣)=1.3×(x﹣),
3=1。3x﹣0。78,
3+0。78=1.3x﹣0.78+0。78,
4。68=1.3x,
4.68÷1。3=1。3x÷1.3,
x=3.6;
(61)(X+0.5):2=(X﹣4):,
×(x﹣4)=(x+0.5)×,
x﹣×4=x+×0.5,
x﹣10﹣x=x+x,
2.25x﹣10+10=0.125+10,
2.25x÷2.25=10.125÷2。25,
x=4。5
(62) X÷0.05=3。528,
X÷0。05×0.05=3。528×0.05,
X=0.1764;
(63)2X﹣4×6=80,
2X﹣24=80,
2X﹣24+24=80+24,
2X=104,
2X÷2=104÷2,
X=52;
(64)4×4.5﹣3X=6。38,
18﹣3X=6.38,
18﹣3X+3X=6。38+3X,
6.38+3X=18,
6.38+3X﹣6。38=18﹣6。38,
3X=11.62,
3X÷3=11.62÷3,
X=;
(65)4X﹣7.2=10,
4X﹣7。2+7。2=10+7.2,
4X=17。2,
4X÷4=17.2÷4,
X=4。3;
(66)11.5X+X=20,
12.5X=20,
12.5X÷12。5=20÷12.5,
X=1.6;
(67)3.8×12+15X=87。6,
45。6+15X=87。6,
45。6+15X﹣45。6=87.6﹣45。6,
15X=42,
15X÷15=42÷15,
X=2。8
(68)6X+5=17,
6x+5﹣5=17﹣5,
6x÷6=12÷6,
x=2;
(69)0。6×(2.5+X)=4。2,
0。6×(2。5+X)÷0。6=4.2÷0。6,
2.5+x=7,
2.5+x﹣2。5=7﹣2.5,
x=4.5;
(70):=X:,
x=×,
x÷=,
x=0.6
(71),
,
,
;
(72)
,
,
,
,
;
(73),
,
,
(74)4(+x)=,
+4x=,
+4x﹣=﹣,
4x=4,
x=1;
(75)×0。25+x=,
0.2+x=,
0.2+x﹣0.2=﹣0。2,
x=,
x=
(76)x﹣,
,
,
x=;
(77)200:6=x:,
6x=200×,
6x÷6=480÷6,
x=80
(78)4÷X=,
4÷X×X=X,
X=4,
X÷=4÷,
X=10;
(79)8(x﹣2)=2(x+7),
8X﹣16=2X+14,
6X﹣16=14,
6X=30,
X=5;
(80):18%=,
X=0.18×6。5,
X=1.17,
X=7.8
(81)﹣2x=,
﹣2x+2x=+2x,
+2x=,
+2x﹣=﹣,
2x=,
2x÷2=÷2,
x=;
(82)x+x=46,
x(+)=46,
x=46,
x÷=46÷,
x=40;
(83):x=:,
x=×,
x=,
x÷=÷,
x=;
(84)=,
1。6x=6.4×2,
1。6x=12。8,
1.6x÷1.6=12.8÷1。6,
x=8
(85)5(3x﹣4)﹣2(x﹣1)=5(2x﹣1)
15x﹣20﹣2x+2=10x﹣5,
13x﹣18=10x﹣5,
13x﹣18﹣10x=10x﹣5﹣10x,
3x﹣18=﹣5,
3x﹣18+18=﹣5+18,
3x=13,
3x÷3=13÷3,
x=;
(86)=,
3(6x﹣1)=64,
18x﹣3=64,
18x﹣3+3=64+3,
18x=67,
18x÷18=67÷18,
x=
(87)8(2X﹣7)=5(X+13),
16x﹣56=5x+65,
16x﹣56﹣5x=5x+65﹣5x,
11x﹣56=65,
11x﹣56+56=65+56,
11x=121,
11x÷11=121÷11,
x=11,
(88)3(x+4.5)=60,
3(x+4.5)÷3=60÷3,
x+4.5=20,
x+4.5﹣4.5=20﹣4.5,
x=15.5
(89)1.6x+2.4=7。52,
1。6x+2.4﹣2。4=7.52﹣2.4,
1。6x=5。12,
1。6x÷1。6=5.12÷1。6,
x=3。2;
(90)3(x﹣0。8)=6.3,
3x﹣2.4=6。3,
3x﹣2.4+2。4=6。3+2。4,
3x=8。7,
3x÷3=8。7÷3,
x=2.9;
(91)28。4﹣5x=5。8,
28.4﹣5x+5x=5.8+5x,
5.8+5x=28.4,
5.8+5x﹣5.8=28.4﹣5。8,
5x=22。6,
5x÷5=22.6÷5,
x=4.52
(92)
x:=
25x=×3,
25x=,
25x÷25=,
x=;
(93)+2x=,
+2x=,
2x=0,
x=0;
(94)x=15%,
x×x=15%x,
0。15x=0。15,
0.15x÷0.15=0.15÷0.15,
x=1;
(95)x﹣x=,
x=,
x=,
x=.
(96)x+50%x=6,
1。5x=6,
1.5x÷1.5=6÷1。5,
x=4;
(97):x=0。3:12,
0.3x=,
0.3x÷0。3=9÷0。3,
x=30;
(98)4x+2(8﹣x)=26,
4x+16﹣2x=26,
2x+16=26,
2x+16﹣16=26﹣16,
2x÷2=10÷2,
x=5
(99)x﹣=0,
x﹣+=0+,
x=,
x×3=×3,
x=;
(100)+x=1,
+x﹣=1﹣,
x=,
x×=×,
x=1;
(101)x×(+)=,
x=,
x×=×,
x=.
(102),
,
,
3x÷3=,
x=;
(103),
,
,
x=20;
(104)x﹣,
,
,
x=;
(105)x×,
x×,
x=
(106)5x+35=650,
5x+35﹣35=650﹣35,
5x=615,
5x÷5=615÷5,
x=123;
(107)720÷3x=80,
720÷3x×3x=80×3x,
240x=720,
240x÷240=720÷240,
x=3;
(108)3。6x﹣0.9x=8.1,
(3.6﹣0。9)x=8.1,
2。7x=8。1,
2。7x÷2.7=8。1÷2。7,
x=3;
(109)4×4。5﹣3x=6,
18﹣3x=6,
18﹣3x+3x=6+3x,
6+3x=18,
6+3x﹣6=18﹣6,
3x=12,
3x÷3=12÷3,
x=4
(110)=,
2。5x=10×0。8,
2.5x÷2.5=8÷2.5,
x=3.2;
(111)6×3﹣1。8X=7.2,
18﹣1.8X=7.2,
18﹣1。8X+1。8X=7.2+1.8X,
7.2+1.8X=18,
7。2+1。8X﹣7.2=18﹣7。2,
1。8X=10.8,
1。8X÷1。8=10.8÷1。8,
X=6
(112)÷x=,
x=÷,
x=;
(113)x÷=42,
x=42×,
x=9;
(114)x+=,
x+﹣=﹣,
x=,
x÷=÷,
x=
(115)7x÷3=8。19,
7x÷3×3=8。19×3,
7x=24.57,
7x÷7=
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