Question

解方程 3x(7-2x)+5x(2x-1)=4x(x-3)+56

Answer 1

21x-6x^2+10X^2-5x-4x^2+12x-56=0

28x-56=0

x=2

1/9 x^2y^2*(2yx^2-xy^2-2yx^2+2xy^2)=(1/9 x^2y^2) *xy^2=1/9 x^3y^4

1/9*(-27/8)*16=-6