展开 A(-4,-7)

解答

展开

A (- 4, - 7)

- 4 A, - 7 A

求解步骤

A (- 4, - 7)

= (- 4, - 7) A

使用分配律:

a (b - c) = ab - a c

a = A, b = - 4,, c = 7

= A (- 4,) - A \cdot 7

使用加减运算法则

+ (- a) = - a

= - 4 A, - 7 A

e x p an d (2 x + \frac{1}{x})^{5}

s im pl i f y (5 x - 10) (3 - x)

e x p an d \frac{20 ( s + 1 )}{s ( 5 s ^{2} + 6 s + 2 )}

e x p an d (- x^{2} + 0.5 x + 5) d x

e x p an d (a + 5) - \frac{b}{b - 4} + \frac{2 ( b + 3 )}{a}