展开 (5e-2f)^2

解答

展开

(5 e - 2 f)^{2}

4 f^{2} - 20 e f + 25 e^{2}

求解步骤

(5 e - 2 f)^{2}

使用完全平方公式:

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

a = 5 e, b = 2 f

= (5 e)^{2} - 2 \cdot 5 e 2 f + (2 f)^{2}

化简

(5 e)^{2} - 2 \cdot 5 e 2 f + (2 f)^{2} : 25 e^{2} - 20 e f + 4 f^{2}

= 25 e^{2} - 20 e f + 4 f^{2}

改写为标准形式

= 4 f^{2} - 20 e f + 25 e^{2}

(a^{3})^{2}

(a^{3})^{3}

\frac{x}{( 2 - x ) ^{2}}

(ln (y) - b y)^{2}

\frac{( x + 5 ) ( x + 1 )}{- 2 x + 3}