展开-pi(x-pi)

解答

展开

- π (x - π)

- π x + π^{2}

求解步骤

- π (x - π)

使用分配律:

a (b - c) = ab - a c

a = - π, b = x, c = π

= - π x - (- π) π

使用加减运算法则

- (- a) = a

= - π x + ππ

ππ = π^{2}

= - π x + π^{2}

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