展开 (4x)(5x)

解答

展开

(4 x) (5 x)

20 x^{2}

求解步骤

(4 x) (5 x)

去除括号:

(a) = a

= 4 x \cdot 5 x

数字相乘:

4 \cdot 5 = 20

= 20 xx

使用指数法则:

a^{b} \cdot a^{c} = a^{b + c}

xx = x^{1 + 1}

= 20 x^{1 + 1}

数字相加:

1 + 1 = 2

= 20 x^{2}

e x p an d \frac{10 ( - j sin ( n wt ) - 1 )}{j w n}

e x p an d \frac{1}{( s + 1 ) ( s ^{2} + 3 + 4 s )}

e x p an d \frac{2 ( x ^{5} - 4 )}{x - 4}

e x p an d \frac{16}{x ^{2} \cdot ( x - 4 )}

e x p an d \frac{1}{s ^{2} ( s - k )}