一张床大约长2 课桌的高度大约80
35+55= 57-18= 9×5= 6×7= 22-5+5=
10-5×2= 30+38= 52+34= 40-17= 7x(4+2)=
①87-32=
②37+49=
③84-26=
④25+36-18=
⑤87-26+15=
⑥95-(36+24)=
①50-18+22=
②95-(48+30)=
③82-2×6=
④63+32-22=
⑤7×9-9=
⑥(32-27)×9=
方法一:
方法二: