展开 (a+b)left(a-b)

解答

展开

(a + b) l e f t (a - b)

e l a^{2} f t - e l b^{2} f t

求解步骤

(a + b) l e f t (a - b)

= e l f t (a + b) (a - b)

乘开

(a + b) (a - b) : a^{2} - b^{2}

= l e f t (a^{2} - b^{2})

乘开

l e f t (a^{2} - b^{2}) : e l a^{2} f t - e l b^{2} f t

= e l a^{2} f t - e l b^{2} f t

e x p an d (2 π + 16) \times 12

e x p an d \frac{1}{( 3 - x ) ^{4}}

e x p an d \frac{3 x ^{2} - x}{( x ^{2} - 3 ) ^{5}}

e x p an d \frac{( x + 6 ) ( x - 1 )}{( x - 8 ) ( x + 9 )}

e x p an d (x^{2} + 1) e^{x}