作业帮分式计算,3和4
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分式计算,3和4
分式计算,3和4
分式计算,3和4
-1 1/(x-1)
3 ：(1/(x+1)-1/(x-1))/(2/(x+1)(x-1))
=(1/(x+1)*(x+1)(x-1)/2)-(1/(x-1)*(x+1)(x-1)/2)
=(x-1)/2-(x+1)/2
=(x-1-x-1)/2
=-1
4:原式=（x+1）/x÷(2x...
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3 ：(1/(x+1)-1/(x-1))/(2/(x+1)(x-1))
=(1/(x+1)*(x+1)(x-1)/2)-(1/(x-1)*(x+1)(x-1)/2)
=(x-1)/2-(x+1)/2
=(x-1-x-1)/2
=-1
4:原式=（x+1）/x÷(2x²-（1+x²）)/x
=（x+1）/x÷（x²-1）/x
=（x+1）/x*（x/（x+1)(x-1）
=1/(x-1)
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