分式计算,就一道,急.
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/26 02:39:27
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分式计算,就一道,急.
分式计算,就一道,急.
分式计算,就一道,急.
x²-2x-1=0
∴x²-1=2x
x²-2x-1=0
所以x²-1=2x
原式=[x(x-1)/(x+1)(x-1)+(x+1)/(x+1)(x-1)]*4x/(x²+1)
=(x²-x+x+1)/(x+1)(x-1)*4x/(x²+1)
=(x²+1)/(x+1)(x-1)*4x/(x²+1)
=4x/(x²-1)
=4x/2x
=2