展开 2sqrt(a)(6sqrt(b)-8)

解答

展开

2 a (6 b - 8)

12 a b - 16 a

求解步骤

2 a (6 b - 8)

使用分配律:

a (b - c) = ab - a c

2 a (6 b - 8) = 2 a \cdot 6 b - 2 a \cdot 8

= 2 a \cdot 6 b - 2 a \cdot 8

化简

2 a \cdot 6 b - 2 a \cdot 8 : 12 a b - 16 a

= 12 a b - 16 a

s im pl i f y (x + 1 + 3) (x + 1 - 3)

e x p an d π Δ (x + Δ x)^{2}

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

e x p an d (z - 2 + 6 i) (z - 2 - 6 i)

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