Đáp án:
Giải thích các bước giải:
(15+37)+(52-37-17)=15+37+52-37-17=15+52-17=67-17=50
(38-42+14)-(25-27-15)=38-42+14-25+27+15=27
-(21-32)-(-12+32)=-21+32+12-32=-21+12=-9
-(12+21-23)-(23-21+10)=-12-21+23-23+21-10=-22
(57-725)-(605-53)=57-725-605+53=-1220
(55+25+15)-(15-55+45)=55+25+15-15+55-45=120
(35+75)+(345-35-75)=35+75+345-35-75=345
(2002-79+15)-(-79+15)=2002-79+15+79-15=2002
-(515-80+91)-(2003+80-91)=-515+80-91-2003-80+91=-2518
