Đáp án + Giải thích các bước giải:
$\rm Bài \ 1 : \\ a) \ -14+(-24)=-(14+24)=-38 \\ b) \ (-18)+18=-(18-18)=0 \\ c) \ 25+5.(-6)=25+(-30)=-(30-25)=-5 \\ d) \ (-13)-(+9).(-7)=(-13)+63=50 \\ e) \ 102-272=-170 \\ f) \ |-15|+(-23)=15+(-23)=-8 \\ Bài \ 2:\ a) \ 9^5 : 9^3-3^2 . 3=9^2-3^3=3^4-3^3=3^3.(3-1)=3^3 .2=27.2=54 \\ b) \ (28+46)+(53-28-31-46)=28+46+51-28-31-46=(28-28)+(46-46)+53-31=22 \\ d) \ (-17)+5+(-3)+17=[(-17)+17]+5+(-3)=2 \\ e) \ 75-(3.5^2-4.2^3)=75-(75-32)=75-75+32=32 \\ f) \ 46.32+54.32=32.(46+54)=32.100=3200 \\ g) \ 2^3 . 17-14+2^3 . 3^2=2^3 . (17+3^2)-14=8.26-14=194$
