展开-4(x-3y=4)

解答

展开

- 4 (x - 3 y = 4)

- 4 x + 12 y = 4

求解步骤

- 4 (x - 3 y = 4)

= - 4 (x - 3 \cdot 4 = y)

使用分配律:

a (b - c) = ab - a c

a = - 4, b = x, c = 3 y = 4

- 4 x - (- 4) \cdot 3 y = 4

使用加减运算法则

- (- a) = a

- 4 x + 4 \cdot 3 y = 4

乘开

- 4 x + 4 \cdot 3 y : - 4 x + 12 y

- 4 x + 12 y = 4

e x p an d \frac{( 3 s + 4 ) ^{3}}{9}

e x p an d \frac{2 - x ( x + 2 + 2 )}{x - 2}

e x p an d \frac{19 x + 2}{2 ( 4 x ^{2} - 6 x + 8 )}

e x p an d \frac{3 ( 13 + 2 13 )}{13}

e x p an d - 2 (x + 2 = - 2 x + 1)