Question

mik cần gấp

 

Answer 1

a) (-4).2.6.25.(-7).5=[(-4).25].(2.5).[6.(-7)]=-100.10.(-42)=42000
b) (-32).125.(-9).(-25)=(8.125).[(-4).(-25)].(-9)=1000.100.(-9)=-900000
c) 47.69-31.(-47)=47(69+31)=47.100=4700
d) (-56)+8(11+7)=(-56)+88+56=56.(-1+1)+88=56.0+88=0+88=88