展开 pi(a+r)sqrt((a-r)^2+h^2)+pir^2

解答

展开

π (a + r) (a - r)^{2} + h^{2} + π r^{2}

πa a^{2} - 2 a r + r^{2} + h^{2} + π r a^{2} - 2 a r + r^{2} + h^{2} + π r^{2}

求解步骤

π (a + r) (a - r)^{2} + h^{2} + π r^{2}

乘开

π (a - r)^{2} + h^{2} (a + r) : πa a^{2} - 2 a r + r^{2} + h^{2} + π r a^{2} - 2 a r + r^{2} + h^{2}

= πa a^{2} - 2 a r + r^{2} + h^{2} + π r a^{2} - 2 a r + r^{2} + h^{2} + π r^{2}

s im pl i f y (x + 2 x - 1 + x - 2 x - 1)^{2}

s im pl i f y (8 + x + 16)^{2}

\frac{\partial}{\partial x} ((z) (x^{3} + y x^{2}))

e x p an d (y + Δ y)^{4} - 2 (y + Δ y)^{3}

e x p an d \frac{1}{1 - 2 x ^{3}}