[微分] 估值計算 (78年清華理工及經濟)

[zptdaniel ()]

The function of y=y(x) is defined implicitly by

the equation y^3 + 3xy + x^3 = 15, where y(1)=2.

Use linear approximation to estimate y(3/2).

Ans:1.7

這一題我完全想不出個解法,請板上的前輩給點提示.

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