展开 (2x+7)^2pi

解答

展开

(2 x + 7)^{2} π

4 π x^{2} + 28 π x + 49 π

求解步骤

(2 x + 7)^{2} π

(2 x + 7)^{2} = 4 x^{2} + 28 x + 49

= π (4 x^{2} + 28 x + 49)

= π (4 x^{2} + 28 x + 49)

打开括号

= π 4 x^{2} + π 28 x + π 49

= 4 π x^{2} + 28 π x + 49 π

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