展开 a[x^2+(-r-s)x+rs]

解答

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a [x^{2} + (- r - s) x + rs]

a x^{2} - a x r - a x s + a rs

求解步骤

a (x^{2} + (- r - s) x + rs)

使用分配律:

m (a + b + c) = ma + mb + m c

a (x^{2} + (- r - s) x + rs) = a x^{2} + a (- r - s) x + a rs

= a x^{2} + a (- r - s) x + a rs

= a x^{2} + a x (- r - s) + a rs

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a x (- r - s) : - a x r - a x s

= a x^{2} - a x r - a x s + a rs

e x p an d x sin (\frac{πn x}{L}) (L - x)

e x p an d A (- 2, - 3) y B (4, 2)

s im pl i f y (r - \frac{1}{2}) (r + \frac{3}{4})

e x p an d (x + Δ)^{4}

e x p an d (x^{4} - x^{3} + x^{2} - x + 1) (x^{4} + x^{3} + x^{2} + x + 1)