求助高数大神,谢谢
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(2)原式=∫(0,1)dx∫(0,x^2)√(x^3+1)dy
=∫(0,1)[x^2*√(x^3+1)]dx
=(2/9)*(x^3+1)^(3/2)|(0,1)
=(4√2-2)/9
(3)原式=∫(0,1)dy∫(0,√y)x^3*siny^3dx
=∫(0,1)dy*[(1/4)*x^4*siny^3]|(0,√y)
=(1/4)*∫(0,1)y^2*siny^3dy
=[-(1/12)*cosy^3]|(0,1)
=1/12
=∫(0,1)[x^2*√(x^3+1)]dx
=(2/9)*(x^3+1)^(3/2)|(0,1)
=(4√2-2)/9
(3)原式=∫(0,1)dy∫(0,√y)x^3*siny^3dx
=∫(0,1)dy*[(1/4)*x^4*siny^3]|(0,√y)
=(1/4)*∫(0,1)y^2*siny^3dy
=[-(1/12)*cosy^3]|(0,1)
=1/12
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