化简-sqrt(a)(sqrt(a)-7sqrt(b))

解答

化简

- a (a - 7 b)

- a + 7 a b

求解步骤

- a (a - 7 b)

使用分配律:

a (b - c) = ab - a c

a (a - 7 b) = a a - a \cdot 7 b

= - (a a - a \cdot 7 b)

a a = a

- a \cdot 7 b = - 7 a b

= - (a - 7 a b)

使用分配律:

- (a - b) = - a + b

- (a - 7 a b) = - a + 7 a b

= - a + 7 a b

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