1、 = - = + = + =-= - = + = + = + 2 = 1 - = += += += -= -= -= += -= 1-= -= -= += -= += += += += -= += -= += -= += += -=
2、 += -= 7-= += -= += += += -= 5-= += -= -= 5- = 1--= += += 2 += -0.25= += += += += += -= 0.74+= 0.375+ -= +=
3、1-= += += + = 1-= -= + = -= - = + = 1 - = + = - = += += += += 1-=-= - = + = + = + = += -= -= -= +=
4、 -= 1-= += -= += +5= 5-= 2=×8= 8÷0.4= ×4= 7-6.38= 36÷0.9 = 5÷0.001 = 13×÷0.02 = 0.36+1.54= 135÷5= ×÷÷3.5= ×÷÷26= 4.57+6.43= 5÷×4= ÷×99= 4.3-1.6= ×7= 0.6+7= ×0
5、5= ×8=×100= ÷×125= 3.2+1.78= 四、计算下面各题,能简算的要简算。 ××32 7.5-(2.5+3.8) 5××5 ×125-10 10-4.8-3.2 ××0.17 ××1.7 ××101 ×27+73×3.25 ÷1.4×1.8 4×9× ××3.2 78-8.5+22-0.5 15-5÷12- + - = - + = + - + ) 0
6、25+ + + + + 10-- -+-(+) +-+- +(+) +--(+) 6-(-) - (+ ) + + ++= +-= - + 25 - - + - - (- ) 5--+ - +++(-) +(-) ++++-(+) 2--= ++= 1--= 1--= ++= ++ + += ++++++-(+) 3 - - - -++- 1-+
7、+﹙-﹚ 2-﹙+﹚ 15-5+7 1-﹙3-1﹚ 1.875-﹙0.25+﹚ --= +-= ++= ++= 1--= ++++4-- -(+) -++2-- - 0.8++0.2 -( -) +(-)2--+- -+--+++- 3–(- ) 6-(-) ++ 4.8+ +++-+- ++++++ + -(- ) + -(+ )+ - + -++ -+-+++ +++ -(-)-(-)
8、+--+-+--+ 1-- + + +- ++ +(-) -+-(+) -(-) 5--+(-) 3-(+) -(-) 2--= -+-(-) -(+) -+ 10-(+) -+ + - + = (+)-(-) --- +++-- -(-)+-(+) 解方程 2x+=4.625 + x = X+= X += +x = x + = χ+= +X=++ x
9、 x +( + )=2 x+0.75- =0.15 x+16 = 35 0.5+4.5x=45.5 X÷4.5 = 20 5x-3x= 3.2 5.5X-3X=15 X-=2X-=1- 3x-29 =19 X-1.6 = 38.9 x-= x - = χ- = + X-+= 4x - =2- 8χ-9.1=22.9 3x-14×2 =11 8X-×5=0.25 3.8x-0.8x=27 -x= -x= -x= - x= -X=3×2-6x = 4.2






