求由曲线y=x与直线Y=x平方所围成的平面图形的面积?
人气:386 ℃ 时间:2019-08-19 05:39:35
解答
先求交点 y=x代入y=x²
x(x-1)=0 解得x=0或1 y=0或1
交点为(0,0) (1,1)
所求面积=∫(x-x²)dx [0,1]
=(x²/2-x³/3)I [0,1]
=1/2-1/3
=1/6
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