2x(x-3)-x(2x-7)=2x^2-6x-2x^2+7x
5x=10 x=2 3x=1 x=1/3 8x=24 x=3 x(x-5)=0 x=0 x=5 2(1-15x)=28 1-15x=14 -15x=-13 x=13/15
(6-y)(6+y)/(y-8)(y/(y-6)-2y/(y-6)^2)+12y/(y-6)=
=(6-y)(6+y)/(y+8)*(y^2-8y)/(y-6)^2+(12-y)/(y-6)=
=-y(6+y)/(y-6)+12y/(y-6)=(-6y-y^2+12y)/(y-6)=(6y-y^2)/(y-6)=y(6-y)/(y-6)=-y
Ответ:-15+5*x-5*x
надеюсь правильно
2·(4c-2)+2·3c+2·(2c+7)+c =
= 8c - 4 + 6c + 4c + 14 + c =
= 19c + 10
Ответ: 19с+10