37+552 87-4936 17+26+3174
18+4654 25+3459 35+8+4093
25+13= 48-18= 80-25= 100-60-30=
36+24= 68-25= 72+19= 25+10+20=
①25+36+18=
②74-37-29=
③92-17+23=
④56+27-32=