展开 solve(pir^2+pir*5.4=46.5,r)

解答

展开

so l v e (π \cdot r^{2} + π \cdot r \cdot 5.4 = 46.5, r)

e π l so v r^{2} + 5.4 e π l so v r = 46.5, r

求解步骤

so l v e (π r^{2} + π r \cdot 5.4 = 46.5, r)

= e l so v (π r^{2} + 5.4 \cdot 46.5 π =, rr)

使用分配律:

a (b + c) = ab + a c

a = so l v e, b = π r^{2}, c = π r \cdot 5.4 = 46.5, r

so l v e π r^{2} + so l v e π r \cdot 5.4 = 46.5, r

e π l so v r^{2} + 5.4 e π l so v r = 46.5, r

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