展开 e(3y-3)^2

解答

展开

e (3 y - 3)^{2}

9 e y^{2} - 18 ey + 9 e

求解步骤

e (3 y - 3)^{2}

(3 y - 3)^{2} = 9 y^{2} - 18 y + 9

= e (9 y^{2} - 18 y + 9)

打开括号

= e 9 y^{2} + e (- 18 y) + e 9

使用加减运算法则

+ (- a) = - a

= 9 e y^{2} - 18 ey + 9 e

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