面积A=1/3
体积V=(3/10)*pai
(1) A=∫(x^(1/2)-x^2)dx 定积0到1
=(2/3)*x^(3/2)-(1/3)x^3 定积0到1
=1/3
(2) V=∫pai*(x^4-x)dx 定积0到1
=pai*[(1/5)x^5-(1/2)x^2] 定积0到1
=pai*(1/5-1/2)
=3pai/10
面积A=1/3
体积V=(3/10)*pai
(1) A=∫(x^(1/2)-x^2)dx 定积0到1
=(2/3)*x^(3/2)-(1/3)x^3 定积0到1
=1/3
(2) V=∫pai*(x^4-x)dx 定积0到1
=pai*[(1/5)x^5-(1/2)x^2] 定积0到1
=pai*(1/5-1/2)
=3pai/10