Đáp án:
1a, (-251+25)-(49+115)-10=-251+25-49-115-10=-400
b, 47-(25+147)+(14-75)=47-25-147+14-75=-186
c, -(-68+79+45)+(-168+79-55)=68-79-45-168+79-55=-200
Bài 2:
1, (-12).(-125).17=25500
2, 15.73-27.(-15)=1095+405=1500
3, (-213).68+213.(-32)=-14484-6816=-21300
4, 77-11.(30+7)=-330
5, 85.(35-27)-35.(85-27)=680-2030=-1350
6, (-310).23-310.73=-71320-2630=-29760
7, 168+72.(-168)+27.(-168)=168-12096-4536=-16464
8, 25+5.(-5-9)=25-70=-45
9, 47.(45-15)-47.(45+15)=2115-705-2115-705=-1410