展开 6x(x+1=21-x)

解答

展开

6 x (x + 1 = 21 - x)

6 x^{2} + 6 x = - 6 x^{2} + 21

求解步骤

6 x (x + 1 = 21 - x)

= 6 x (x + 1 \cdot 21 = - x)

打开括号

6 xx + 6 x \cdot 1 = 21 + 6 x (- x)

使用加减运算法则

+ (- a) = - a

6 xx + 6 \cdot 1 \cdot x = 21 - 6 xx

化简

6 xx + 6 \cdot 1 \cdot x = 21 - 6 xx : 6 x^{2} + 6 x = - 6 x^{2} + 21

6 x^{2} + 6 x = - 6 x^{2} + 21

e x p an d 2 (- 7 - 3)

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

e x p an d 2 x (2 - ln (x))

e x p an d (e^{2 x}) (e^{x} + e^{x} x)

\frac{d}{d t} ((P (t, M)) (r (t, M) P (t, M) (M - P (t, M))))