展开-2(x-3y=6)

解答

展开

- 2 (x - 3 y = 6)

- 2 x + 6 y = 6

求解步骤

- 2 (x - 3 y = 6)

= - 2 (x - 3 \cdot 6 = y)

使用分配律:

a (b - c) = ab - a c

a = - 2, b = x, c = 3 y = 6

- 2 x - (- 2) \cdot 3 y = 6

使用加减运算法则

- (- a) = a

- 2 x + 2 \cdot 3 y = 6

乘开

- 2 x + 2 \cdot 3 y : - 2 x + 6 y

- 2 x + 6 y = 6

e x p an d \frac{( x - 6 ) ( x - 5 )}{- 7 x - 2}

e x p an d \frac{x}{1 + x ( y + z )}

e x p an d 4 (p - 5 = - 35)

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

e x p an d \frac{2 x + 8}{( x + 2 ) ^{2} ( s + 3 )}