高数题求解16
2个回答
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利用球坐标系
x=rcosθsinφ
y=rsinθsinφ
z=rcosφ
r∈[0,1]
θ∈[0,π/2]
φ∈[0,π/2]
∫∫∫Ω xyzdV
=∫(0,π/2)dθ∫(0,π/2)dφ∫(0,1) r^5 sinθcosθsin³φcosφdr
=∫(0,π/2) 1/2 sin2θdθ∫(0,π/2) sin³φdsinφ∫(0,1) r^5 dr
=1/2×1/4×1/6
=1/48
选择A
x=rcosθsinφ
y=rsinθsinφ
z=rcosφ
r∈[0,1]
θ∈[0,π/2]
φ∈[0,π/2]
∫∫∫Ω xyzdV
=∫(0,π/2)dθ∫(0,π/2)dφ∫(0,1) r^5 sinθcosθsin³φcosφdr
=∫(0,π/2) 1/2 sin2θdθ∫(0,π/2) sin³φdsinφ∫(0,1) r^5 dr
=1/2×1/4×1/6
=1/48
选择A
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