展开 (sqrt(pi)+sqrt(e))(sqrt(pi)-sqrt(e))

解答

展开

(π + e) (π - e)

π - e

十进制

0.42331 \dots

求解步骤

(π + e) (π - e)

使用平方差公式:

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

a = π, b = e

= (π)^{2} - (e)^{2}

化简

(π)^{2} - (e)^{2} : π - e

= π - e

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e x p an d x^{2} - 5 (- 2, - 1)

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