36×25%+3.6×7.5簡便計算

36×25%+3.6×7.5簡便計算

36×25%+3.6×7.5
=36x0.25+3.6x7.5
=3.6x2.5+3.6x7.5
=3.6x(2.5+7.5)
=3.6x10
=36