3+21= 40+8= 36+8= 56-6=
72-50= 68-7= 37+6= 48+8=
①45+36=
②52-28=
③56+39=
④85-67=
⑤46+25+17=
⑥85-37-18=
⑦58+41-39=
⑧79-(24+30)=
35-1522 43-822+9
42+1846 55-2518+10
6+2834 45-3554-23
32+24 25+34
75-28-19 52-28+30
36+(28-19) 73-21+15
一条裤子多少钱?买这两件一共需要多少钱?