展开 (3e+8)(3e-8)

解答

展开

(3 e + 8) (3 e - 8)

9 e^{2} - 64

十进制

2.50150 \dots

求解步骤

(3 e + 8) (3 e - 8)

使用平方差公式:

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

a = 3 e, b = 8

= (3 e)^{2} - 8^{2}

化简

(3 e)^{2} - 8^{2} : 9 e^{2} - 64

= 9 e^{2} - 64

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e x p an d \frac{x + 3}{( x - 4 ) ( x + 1 )}