(12.5+0.125)*8-98=12.5*8-0.125*8-98=100-1-98=1
解:用乘法分配律,因为125*8正好是1000,很好算,所以解题过程如下: (12.5+1.25+0.125)*8 =100+10+1 =111 望对你有帮助,谢谢!
12.5*8+0.125*8-81=100+1-81=20
(12.5+0.125)X8=12.5*8+0.125*8=100+1=101
(1.25+12.5+0.125)*8=1.25*8+12.5*8+0.125*8=10+100+1=111.满意请采纳.
原式可以换为:0.34*12.5+12.5*0.66 =(0.34+0.66)*12.5 =1*12.5 =12.5 做这种题尽量保留整数,学会用等式的性质,会用乘法结合律当然要先找到长得比较像的两个数,在变形、、、
原式=8*12.5+8*0.125=100+1=101&原式=8*0.125*(100+1)=1*101=101
(12.5 +0.125)x8-98=12.5*8+0.125x8-98=100+1-98=101-98=3
(12.5 +0.125)x8-98=12.5*8+0.125x8-98=100+1-98=101-98=3
=(12.5*8+0.125*8)-98 =101-98 =3