高等数学,图中证明题求解 10
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I = ∫∫∫<Ω>f1(x)f2(y)f3(z)dxdydz
=∫<a, b>dx∫<c, d>dy∫<l,m> f1(x)f2(y)f3(z)dz
=∫<a, b>dx∫<c, d>dy f1(x)f2(y)∫<l,m>f3(z)dz
=∫<a, b>dx∫<c, d> f1(x)f2(y)dy∫<l,m>f3(z)dz
=∫<a, b>dx f1(x)∫<c, d>f2(y)dy∫<l,m>f3(z)dz
=∫<a, b>f1(x)dx∫<c, d>f2(y)dy∫<l,m>f3(z)dz
=∫<a, b>dx∫<c, d>dy∫<l,m> f1(x)f2(y)f3(z)dz
=∫<a, b>dx∫<c, d>dy f1(x)f2(y)∫<l,m>f3(z)dz
=∫<a, b>dx∫<c, d> f1(x)f2(y)dy∫<l,m>f3(z)dz
=∫<a, b>dx f1(x)∫<c, d>f2(y)dy∫<l,m>f3(z)dz
=∫<a, b>f1(x)dx∫<c, d>f2(y)dy∫<l,m>f3(z)dz
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