:a)b(m-7)-7b б)x(c+1)+c(x-1) в)y(x-4)+x(3-y) г)m(k-3)-k(m-5) д)a(1-b)-a(1+b) е)b(2d-5)-b(d+5)

а)b(m - 7) - 7b=bm-7b-7b=bm-14b

б)x(c + 1) + c(x - 1)=xc+x+xc-c=2xc+x-c

в)y(x - 4) + x(3 - y)=yx-4y+3x-yx=3x-4y

г)m(k - 3) - k(m - 5)=mk-3m-mk+5k=5k-3m

д)a(1 - b) - a(1 + b)=a-ab-a-ab=-2ab

e)b(2d - 5) - b(d + 5)=2bd-5b-bd-5b=bd-10b

a)b(m-7)-7b=bm-7b-7b=bm-14b

б)x(c+1)+c(x-1)=cx+x+cx-c=x+2cx-c

в)y(x-4)+x(3-y)=xy-4y+3x-xy=3x-4y

г)m(k-3)-k(m-5)=km-3m-km+5k=5k-3m

д)a(1-b)-a(1+b)=a-ab-a-ab=-2ab

е)b(2d-5)-b(d+5)=2bd-5b-bd-5b=bd-10b