展开 3(x-1=2x+9)

解答

展开

3 (x - 1 = 2 x + 9)

3 x - 3 = 2 x + 27

求解步骤

3 (x - 1 = 2 x + 9)

= 3 (x - 1 \cdot 2 = x + 9)

打开括号

= 3 x + 3 (- 1 = 2 x) + 3 \cdot 9

使用加减运算法则

+ (- a) = - a

3 x - 3 \cdot 1 = 2 x + 3 \cdot 9

化简

3 x - 3 \cdot 1 = 2 x + 3 \cdot 9 : 3 x - 3 = 2 x + 27

3 x - 3 = 2 x + 27

e x p an d (a - 2) (a + 3)^{''}

e x p an d - 3 e^{3 x} (e^{- x} x - 2 e^{- x})

e x p an d \frac{5 ( 3 x + 7 )}{16 x}

e x p an d (x - y) 2

e x p an d (1 - \frac{1}{4} x)^{16}