63-27+15 (89-35)÷9 15+6×7
97-(34+18) 6×(30-25) (18+17)÷5
⑴88-(46-18)
=
⑵63÷(44-37)
⑶42-42÷7
“6×24”解决的问题是:
“24×2”解决的问题是:
60÷80%= 75%+0.25= = =