hzb53jl55v的部落格

標題:

express f.2

發問:

Given that x=1/n+1 and y=n/n-1 ai)express n in terms of x. ii)express n in terms of y. bi)express y in terms of x. ii)express x in terms of y.

最佳解答:

ai)express n in terms of x. x=1/n+1 nx+x=1 nx=1-x n=(1-x)/x----------(1) ii)express n in terms of y. y=n/n-1 ny-y=n ny-n=y n(y-1)=y n=y/(1-y)---------(2) bi)express y in terms of x. (1)=(2) (1-x)/x=y/(1-y) y-yx=x-xy y=x ii)express x in terms of y. for y=x in bi) so x=y

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