推 baseketed:看題目給的R,他有給x,y的限制,把它用參140.116.131.172 06/20 07:53
→ baseketed:數換成r,θ的限制140.116.131.172 06/20 07:54
→ baseketed:我瞎了沒看到下面那篇= ="sorry140.116.131.172 06/20 07:54
→ chemical1223:一樣謝謝你^^ 163.24.226.36 06/20 09:29
2 2
(x + y ) 2 2
∫∫ e dxdy R={(x,y)｜0≦y≦x,x + y ≦1}
R
書上解法是
1.
令x=rcosθ,y=rsinθ
2.
D={(r,θ)｜0≦r≦1,0≦θ≦ pi/4}
.
.
.
請問一下r跟θ要怎麼找它的範圍？
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◆ From: 163.24.226.36
※ 編輯: chemical1223 來自: 163.24.226.36 (06/20 02:16)
※ chemical1223:轉錄至看板 Math 06/20 02:17