solvefor x,(2x+2y)(x-y)=2x(x-y)+2y(x+y)

解答

求解

x, (2 x + 2 y) (x - y) = 2 x (x - y) + 2 y (x + y)

对所有 x 为真; 0 = 4 y^{2}

求解步骤

(2 x + 2 y) (x - y) = 2 x (x - y) + 2 y (x + y)

乘开

2 x (x - y) : 2 x^{2} - 2 x y

2 x^{2} - 2 y^{2} = 2 x^{2} - 2 x y + 2 y (x + y)

乘开

2 y (x + y) : 2 x y + 2 y^{2}

2 x^{2} - 2 y^{2} = 2 x^{2} - 2 x y + 2 x y + 2 y^{2}

e = 32 g h

so l v e f or x, 2^{y + 1} = x + 1

- 6 x + 2 = 0

- (x + 7) = - 6 x + 8

36 t - 19 t - 12 t - t = 52