展开 (a+b-c)(d+e)

解答

展开

(a + b - c) (d + e)

a d + e a + b d + e b - c d - ec

求解步骤

(a + b - c) (d + e)

打开括号

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

使用加减运算法则

+ (- a) = - a

= a d + e a + b d + e b - c d - ec

e x p an d \frac{k ^{3}}{( n ^{4} + k ^{4} ) ^{2}}

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e x p an d \frac{36000 x ^{2} - 1800 x + 90}{x ^{2} ( x - 0.1 ) ^{2}}

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