Question

пж помогите очень надо

Answer 1

1)=0.8a*0.45bc=0.36ab(-c)=0.36abc
2)=(-m*0.75n)(-0.6k)=-(-m*0.45nk)=m*0.45nk
3)3x-2.1y+0.1y=3x-2y
4)=-4.5m+5.5n-1.5m+1.9n=-6m+5.5n+1.9n=-6m+7.4n