展开 2(x-7=-2x-6)

解答

展开

2 (x - 7 = - 2 x - 6)

2 x - 14 = - 4 x - 12

求解步骤

2 (x - 7 = - 2 x - 6)

打开括号

= 2 x + 2 (- 7 =) + 2 (- 2 x) + 2 (- 6)

使用加减运算法则

+ (- a) = - a

2 x - 2 \cdot 7 = - 2 \cdot 2 x - 2 \cdot 6

化简

2 x - 2 \cdot 7 = - 2 \cdot 2 x - 2 \cdot 6 : 2 x - 14 = - 4 x - 12

2 x - 14 = - 4 x - 12

e x p an d (3 x + 1) (lo g_{2} (x) + x)

e x p an d - \frac{wl}{2} (x - \frac{l}{2})^{2}

e x p an d \frac{20 ( y + 2 )}{3}

e x p an d \frac{- x ^{2} + 6 x}{( x ^{2} - 3 x + 9 ) ^{2}}

e x p an d \frac{3 x - 3}{( x + 5 ) ( x + 2 )}