Re: [考古] 93中正
※ 引述《henry9621205 (清心小子)》之銘言：
: The base of solid is the region in the xy-plane bouned by the y-axis
: and the lines y=1-x,y=2x+5 and x=2.Each cross section perpendicular
: to the xy-plane is a square.Find the volume of the soild.
: ans:104
: 幫解..謝謝！！
dV={(2x+5)-(1-x)}^2*dx=(3x+4)^2*dx
2 2
V=∫(3x+4)^2*dx=(3x^3+12x^2+16x) =104
0 0
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