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令y=ux則x^2(xdu+udx)/dx=2(ux)^2+ux^2約掉x^2 (xdu+udx)/dx=2(u)^2+u所以(xdu)/dx=2(u)^2 之後你該知道了吧求出u關於x的運算式再有y=ux ok了
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