展开 pi(2+r)^2h

解答

展开

π (2 + r)^{2} h

4 πh + 4 πh r + πh r^{2}

求解步骤

π (2 + r)^{2} h

(2 + r)^{2} = 4 + 4 r + r^{2}

= πh (r^{2} + 4 r + 4)

= πh (4 + 4 r + r^{2})

打开括号

= πh \cdot 4 + πh \cdot 4 r + πh r^{2}

= 4 πh + 4 πh r + πh r^{2}

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