展开 (x+e)(x-pi)

解答

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(x + e) (x - π)

x^{2} - π x + e x - e π

求解步骤

(x + e) (x - π)

使用 FOIL 方法:

(a + b) (c + d) = a c + a d + b c + b d

a = x, b = e, c = x, d = - π

= xx + x (- π) + e x + e (- π)

使用加减运算法则

+ (- a) = - a

= xx - π x + e x - e π

xx = x^{2}

= x^{2} - π x + e x - e π

e x p an d A (- 5, 3) B (3, 2,) C (- 1, - 4)

e x p an d \frac{5 ( x - 32 )}{9}

e x p an d (9 x^{2} + x^{4}) d x

e x p an d 2 (\frac{ln ( x ^{10} + 3 )}{10} + C)

e x p an d p a r am e t r i c (x + y + z = 4)