展开 x(x^2y=4+y)

解答

展开

x (x^{2} y = 4 + y)

x^{3} y = 4 + x y

求解步骤

x (x^{2} y = 4 + y)

= x (4 = x^{2} y + y)

使用分配律:

a (b + c) = ab + a c

a = x, b = x^{2} y = 4, c = y

x x^{2} y = 4 + x y

x^{2} x y = 4 + x y

乘开

x^{2} x y : x^{3} y

x^{3} y = 4 + x y

e x p an d \frac{3 ( p + q )}{p - q}

e x p an d (0, 4) y (6, - 2)

e x p an d \frac{x + 1}{x ^{2} ( x + 2 ) ^{3}}

e x p an d \frac{1}{s ( s + 15 ) + 50}

e x p an d, (w^{2} - 5 w - 4) (7 w^{2} - 6 w + 2)