简便运算(19.4-15.8)X0.25-90x0.01

问题描述:

简便运算(19.4-15.8)X0.25-90x0.01

(19.4-15.8)×0.25-90×0.01
=4.6×0.25-0.9
=4×0.25+0.6×0.25-0.9
=1+0.15-0.9
=0.25