y=(x^2+x+14)/(x-2)是怎么变成 y=[(x-2)^2+5(x-2)+20]/(x-2)的呢?
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y=(x^2+x+14)/(x-2)是怎么变成 y=[(x-2)^2+5(x-2)+20]/(x-2)的呢?
分子:
x^2+x+14
=x²-4x+4x+x+14
=x²-4x+5x+4+20-10
=(x²-4x+4)+(5x-10)+20
=(x-2)²+5(x-2)+20
再问: [(x-2)+5(x-2)+20]/x-2 可以化简成 [(x-2)+(20/x-2)]+5 ?
再答: [(x-2)²+5(x-2)+20]/(x-2 ) = [(x-2)²/(x-2)]+ [5(x-2)/(x-2)]+ [20/(x-2)] =[(x-2)]+[5]+[20/(x-2)] = [(x-2)+(20/x-2)]+5
x^2+x+14
=x²-4x+4x+x+14
=x²-4x+5x+4+20-10
=(x²-4x+4)+(5x-10)+20
=(x-2)²+5(x-2)+20
再问: [(x-2)+5(x-2)+20]/x-2 可以化简成 [(x-2)+(20/x-2)]+5 ?
再答: [(x-2)²+5(x-2)+20]/(x-2 ) = [(x-2)²/(x-2)]+ [5(x-2)/(x-2)]+ [20/(x-2)] =[(x-2)]+[5]+[20/(x-2)] = [(x-2)+(20/x-2)]+5
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