展开 ((-3-x)^2)/2

解答

展开

\frac{( - 3 - x ) ^{2}}{2}

\frac{x ^{2}}{2} + 3 x + \frac{9}{2}

求解步骤

\frac{( - 3 - x ) ^{2}}{2}

(- 3 - x)^{2} = 9 + 6 x + x^{2}

= \frac{9 + 6 x + x ^{2}}{2}

使用分式法则:

\frac{a \pm b}{c} = \frac{a}{c} \pm \frac{b}{c}

\frac{9 + 6 x + x ^{2}}{2} = \frac{9}{2} + \frac{6 x}{2} + \frac{x ^{2}}{2}

= \frac{9}{2} + \frac{6 x}{2} + \frac{x ^{2}}{2}

数字相除:

\frac{6}{2} = 3

= \frac{9}{2} + 3 x + \frac{x ^{2}}{2}

改写为标准形式

= \frac{x ^{2}}{2} + 3 x + \frac{9}{2}

e x p an d \frac{a s + b + 3 a + 1}{s ( s + 1 ) ( s + 2 )}

e x p an d 2 a - (x - c)^{2} + y^{2}

e x p an d (x^{7})^{2}

e x p an d \frac{( x + h ) ^{2} - 3 ( x + h ) + 4}{h}

e x p an d (x + 3) + \frac{x + 7}{2 - x}