Giải thích các bước giải:
Bài 1:
a.$-7264+(1543+7264)=-7264+1543+7264=(-7264+7264)+1543=1543$
b.$(144-97)-144=144-97-144=(144-144)-97=0-97=-97$
c.$(-145)-(18-145)=-145-18+145=(145-145)-18=-18$
d.$111+(-11+27)=111-11+27=(111-11)+27=100+27=127$
e.$(27+586)-(486-73)=27+586-486+73=(27+73)+(586-486)=100+100=200$
f.$271-[(-43)+271-(-17)]=271-[-43+271+17]=271+43-271-17=(271-271)+43-17=26$
Bài 2:
a.$35.18-35.28=35.(18-28)=35.(-10)=-350$
b.$45-45.(-12+3)=45-45.(-9)=45+45.9=45.(9+1)=45.10=450$
c.$24.(16-5)-16(24-5)= 24.16-24.5-16.24+16.5=(24.16-16.24)-(24.5-16.5)=-5(24-16)=-5.8=-40$
d.$29(19-13)-19(29-13)=29.19-13.29-19.29+19.13=(29.19-19.29)+13(19-29)=-13.10=-130$
e.$31.(-18)+21.(-81)-31=31(-18-81-1)=-31.100=-3100$
f.$(-12).47+(-12).52+(-12)=-12.(47+52+1)=-12.100=-1200$
