搜狗做题网三道数学题,今晚就要1.(2a/a-1-a/a-1)/a2.（x/x-1-x/x^2-1)/x^2-x/x^2-2x+1
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三道数学题,今晚就要
1.(2a/a-1-a/a-1)/a
2.（x/x-1-x/x^2-1)/x^2-x/x^2-2x+1
3.(1-3/x+2)/x^2-1/x+2
三题都是化简,
1.(2a/a-1-a/a-1)/a
2.（x/x-1-x/x^2-1)/x^2-x/x^2-2x+1
3.(1-3/x+2)/x^2-1/x+2
三题都是化简,
1.(2a/a-1-a/a-1)/a=【（2a-a)/(a-1)】/a=1/(a-1)
2.（x/x-1-x/x^2-1)/x^2-x/x^2-2x+1
=[(x+1)x-x)(x-1)²]/[(x²-1)(x²-x)]
=x²(x-1)²/[x(x-1)²(x+1)]
=x/(x+1)
3.(1-3/x+2)/x^2-1/x+2
=(x+2-3)/(x²-1)
=(x-1)/(x-1)(x+1)
=1/(x+1)
2.（x/x-1-x/x^2-1)/x^2-x/x^2-2x+1
=[(x+1)x-x)(x-1)²]/[(x²-1)(x²-x)]
=x²(x-1)²/[x(x-1)²(x+1)]
=x/(x+1)
3.(1-3/x+2)/x^2-1/x+2
=(x+2-3)/(x²-1)
=(x-1)/(x-1)(x+1)
=1/(x+1)
三道数学题,今晚就要1.(2a/a-1-a/a-1)/a2.（x/x-1-x/x^2-1)/x^2-x/x^2-2x+1
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