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圓:x²;+y²;=r²;,(注意,r為常數)x²;=(r²;- y²;)———[1]切片面積:A =πx²;———[2]切片體積:用[2]的結果δv = A *δyδv =πx²;δy,用[1]的結果δv =π(r²;…
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