化简 (7sqrt(a)-y)^2

解答

化简

(7 a - y)^{2}

49 a - 14 y a + y^{2}

求解步骤

(7 a - y)^{2}

使用完全平方公式:

(a - b)^{2} = a^{2} - 2 ab + b^{2}

(7 a - y)^{2} = (7 a)^{2} - 2 \cdot 7 a y + y^{2}

= (7 a)^{2} - 2 \cdot 7 a y + y^{2}

(7 a)^{2} = 49 a

- 2 \cdot 7 a y = - 14 y a

= 49 a - 14 y a + y^{2}

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e x p an d \frac{3 ( - 2 x ^{2} + 24 x )}{( 5 x ^{2} - 2 x + 12 ) ^{2}}

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