①47+35=
②72-34=
③20+36+38=
④81-36-28=
⑤46+36-28=
⑥72-(38+16)=
8×7+20=
7×9+17=
6×8+40=
5×9-9=
5×7-35=
9×6-38=
24÷618 18÷62 12÷33
5×46×3 3×32×5 5+55×2
改正: