①53+34=
②76-42=
③19+49=
④78-38-13=
⑤33+26+18=
⑥91-(63+19)=
7×7=
9×3=
4×6=
5×7=
6×9=
9×7=
6+8=
3×7=
35+6=
30+56=
48+20-7=
23+25=
54+18=
29-20+7=
78-7=
90-39=
6+30+34=
①36+47=
②45+19+27=
③75-28-19=
④61-37=
⑤70-37+28=
⑥38-(50-47)=
①38+44=
②80-54=
③46+27=
④52-38+24=
⑤80-(56+8)=
⑥61-(36-18)=
①58+26=
②95-57=
③☆46+24-20=
④☆53-9-37=
⑤☆85-(36+20)=
列式是;
买5个皮球需要多少元?列式是。