1、.小学数学四则运算简便运算大汇总简便运算4+3.25+6.8 25(80.4)1.25 7(2) (+)72 93.53 1125997 998+1246+9989 (870087087)871258.8 1.34.253.73.75 17.15(3.52.85)3.4993.4 4.81.01 0.4(2.573) (1.61.61.61.6)25 () 12.32.455.74.55 2 0.1250.256464.2870.6421300 78367.87417 1780.1250.5 2.42+4.5843 251004.253(21) 3.83.93.90.10.13.9 12.1(
2、+)105 -(+ ) - 41( + ) -(- ) + + 1 - - + 4 5 -( + ) 4-(2.5+1.9)(0.5-0.5) 4-2.5+1.9(0.5-0.5) 4-2.5+1.90.5-0.5 4-(2.5+1.90.5)-0.54-(2.5+1.9) (0.5-0.5) 4-(2.5+1.9) 0.5-0.512-4-2-5-12.5% 0.125+8.25+12.5%(+) 2.50.4215-2.25-7 +(-)10(-0.5) (2.7-4.25)2.81.25+17.4+125% 10-4.687.2+0.05 1(5-5) 18.09(1.5+2)3.75-
3、0.840.3(1.9618.9) -(0.15+) 1.81325+5401815 2.58+9.5+40.125 2.1+7(3-1.625) 12.5-2.1+9.63 (7+72+7)43.8+1+6.2+3(4-3.5) (2+-1)122.58+3.5+0.125(9.5+9+9+9.5) 12 3-(1+1)1(0.05+)0.25-125% 5.350.25+2.65(3+-2)(180%) (4.20.7+6) 0.832.512.5 7.69.90.018.320.58-0.320.581.255+0.252010.69-2.52.40.32.50.048.457+8.44
4、2+8.4130.6527.210.1-7.21.22.5+2.82.5320.653.23.51525(4+)60(+-)0.35+0.650.2537.5%+25%+25%0.350.654+5-521000()15932()(3) (+)28 +3 + 11 () () ()-()-() ()-()12.065.072.94 30.349.7610.34 33 2574 3441.7 1.250.8 17+7 1,41.0619.7220.28 73+ 8+2 11+7+3700145 18.62.50.4 13 29 5.68(5.394.32) 19.68(2.979.68) 7+(
5、) 5()1.25(80.5) 0.25(41.2) 1.25(2130.8) 0.74(71)24(-) (12+) 7 (7-) 9.3(4)0.921.410.928.59 - 1.311.61.61.3 11.618.49999+999+99+9 4821-998 3.212.525 1.2588 7.60.25 3.50.125 3.89.90.38 103-2- (138)125 37002185815 20(175) 4725314205 25(4032) (57)80 49258141256 162554 259468741532 234540735 25645 25(64)
6、(86)1251027.35.1 3.60.25 2.69.9 1.062.54 () ()【()】 【()】 ()88 1348() 99 50.125 453 ()() 7 【1()】 ()12 2 () () 4() 50.125 3 + + 18(+) = (+)= 7+5 ()(24) (+) (+) 8x3(x6)25x: (3217)(25) () (2121) (99)9 ()()30 3 1210%110 4 5841 () 5X3=X= 235 - 13518 153 0.653 () 10 - - + 60%28 1.60.1250.5 2513.098.124.88 1
7、2103450075 () ()151137.519.52.54 1.75x0.5x6.25 x30 6:x:0.8331.25 10 9.564.8751.44 6 4.618.415 99.999999.9 416 1822801.25 251.2548 0.73.94.36.1 7.35997.35 47817 46101 15.624 142143 3 4312 75 ()240.42.50.0750 () 411.750.4 49625016 10.2(1.252.5)1.5 ()45 2() 0.31(3.32.95) 4949854985 ()() ()()3524() 3.74
8、4.86.23.74 () 8.64.3 (0.25) 3.6(4.72.3)1.2 17.18.81.2 3.625 () 60()17504501832 0.81(3.22.95) () 2.53.70.4 12() (910) 101.125.935.10.85 ()(1)2.62 31 1.919.9199.91999.90.4 () () 11.2512.21 44 () 4.81.23.51.4 1.80.258.24 (10) 168.1(4.320.4) ()25.12517.4 0.3874 7.83(1.262.17)0.24 () () (20.121)5.1 24(5)
9、 4035.754.25 1516 3.641(2.09) ()45 22203723 6.24.53.8 () 7(0.352) () 4143() 8.50.7556.51 10.540.90.75 24()3 () () () () (1) (5)(1) (3211) 73.2525.48 6434 (4) 15(25) 6.41.253 0.254() () () 15.632(1)3.6 (1 + ) - 0 ( + ) 3.68 1 (2 2.09 ) 2 (11.9- 8.4) 1.3 + 20 .0183+ 1.7200.1(0.40.8)(2.512.5) 1xx 2.1x7
10、.9x0.29 127x0.3 3.2(1)32 1243 99 3.7541.63 12.52.50.4 31 13.92(1.199.92)2.815566(1111)40.24802.4 () ()(4):30 x1 = 63-1.8x=7.280799+807 25 0.6+3.1+5.4+6.9 1-(-)() 0.52.512.564 2X=0.5 XX= 2:(1X)= 0.36:X=: 80.516 7560240.6(2)2 (3112.51)13 70.2420.875:x x x 9.45 3.752x1 3x44.715.814.2 21.60.840.84 33.73
11、.65.33 30 130%52 -37.5%=0.125 12X 5 X3.25417 1 (1- ) (37.5%)484.67(2.980.67) 46 20() 13 30() 1.250.25= X 1.6 =30% X X=42 () 3754501825 1() 1 (3) () 93.6 (1.20.6)5 () 2.3755.625 ()+ X = 4 = 4X2.541.5 9 56 (2296734436)2.4() 49 3.8 3.8450.81.25 () 【()】 x=18 x =4 4x3 9 = 29 x + x = 41258 ()24 () 3 3 7 8.92 6.1 0.36101 1723-237 20(5.6 + 4.8)1.3 3.2(2.15 + 1.956.5) ( + ) + 36( + ) + (8+) 236(1- ) + 6 8.4 6 + 6(+)3.6 + + 76XX = X= 15 40%X - = 1 () ()2精选范本