Question

6.25×7.5+0.75×37.4怎么简便运算

Answer 1

6.25×7.5+0.75×37.4
=6.25×7.5+7.5×3.74
=7.5×（6.25+3.74）
=7.5×9.99
=7.5×（10-0.01）
=7.5×10-7.5×0.01
=75-0.075
=74.925