(72.5-40)/5=7.5
6.5元具体步骤:72.5-40=32.5元32.5÷5=6.5元
(72.5-40)÷5=6.5
72.5-4032.5/5=6.5
sb人家6.5是对的,你还把7.5弄成最佳答案