展开 (x+7)\sqrt[7]{x-9}

解答

展开

(x + 7) 7 x - 9

x 7 x - 9 + 7 7 x - 9

求解步骤

(x + 7) 7 x - 9

= 7 x - 9 (x + 7)

使用分配律:

a (b + c) = ab + a c

7 x - 9 (x + 7) = 7 x - 9 x + 7 x - 9 \cdot 7

= 7 x - 9 x + 7 x - 9 \cdot 7

= x 7 x - 9 + 7 7 x - 9

e x p an d (6 + 5) {+}

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

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

e x p an d e^{x} sec (y) d x + (1 + e^{x}) sec (y) tan (y) d y

s im pl i f y (\frac{10}{3} - \frac{3 m ^{4}}{2}) (\frac{10}{3} + \frac{3 m ^{4}}{2})