两道数学分式题
1个回答
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1.第一题是这样吧,(-1)/(X+3)-6/(9-X^2)-(X-1)/(6+2X),这只是一种情况。
(-1)/(X+3)-6/(9-X^2)-(X-1)/(6+2X)
=(-1)/(X+3)-6/(3+x)(3-x)-(X-1)/2(3+X)
=(-1)2(3-x)-6×2-(x
-1)(3-x)/(3+x)(3-x)×2
=(x^2-2x-15)/(3+x)(3-x)×2
=(x+3)(x-5)/(3+x)(3-x)×2
=(x-5)/2(3-x)
2.原题是这样的吧
24/(a^2+4a-5)+4/(a+5)合理点
24/(a^2+4a-5)+4/(a+5)
=24/(a+5)(a-1)+4/(a+5)
=(24+4(a-1))/(a+5)(a-1)
=(24+4a-4)/(a+5)(a-1)
=4/(a-1)
(-1)/(X+3)-6/(9-X^2)-(X-1)/(6+2X)
=(-1)/(X+3)-6/(3+x)(3-x)-(X-1)/2(3+X)
=(-1)2(3-x)-6×2-(x
-1)(3-x)/(3+x)(3-x)×2
=(x^2-2x-15)/(3+x)(3-x)×2
=(x+3)(x-5)/(3+x)(3-x)×2
=(x-5)/2(3-x)
2.原题是这样的吧
24/(a^2+4a-5)+4/(a+5)合理点
24/(a^2+4a-5)+4/(a+5)
=24/(a+5)(a-1)+4/(a+5)
=(24+4(a-1))/(a+5)(a-1)
=(24+4a-4)/(a+5)(a-1)
=4/(a-1)
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