分式计算题
1.4/9ab^2-5/12a^2b2.a/(a^2)-(2a+1)/(3-1)÷(2-a)/(9-a^2)3.[x/(x-1)-x/(x+1)]*(1-x^2)4x...
1.4/9ab^2-5/12a^2b
2.a/(a^2)-(2a+1)/(3-1)÷(2-a)/(9-a^2)
3.[x/(x-1)-x/(x+1)]*(1-x^2)4x 展开
2.a/(a^2)-(2a+1)/(3-1)÷(2-a)/(9-a^2)
3.[x/(x-1)-x/(x+1)]*(1-x^2)4x 展开
展开全部
1.4/9ab^2-5/12a^2b
=16a/36a²b²-15b/36a²b²
=(16a-15b)/36a²b²
2.a/(a^2)-(2a+1)/(3-1)÷(2-a)/(9-a^2)
=1/a-(2a+1）...题输入输入吧
3.[x/(x-1)-x/(x+1)]*(1-x^2)4x
=-(x²+x-x²+x)/(x²-1)*（x²-1)?4x
=-2x/4x
=-1/2
=16a/36a²b²-15b/36a²b²
=(16a-15b)/36a²b²
2.a/(a^2)-(2a+1)/(3-1)÷(2-a)/(9-a^2)
=1/a-(2a+1）...题输入输入吧
3.[x/(x-1)-x/(x+1)]*(1-x^2)4x
=-(x²+x-x²+x)/(x²-1)*（x²-1)?4x
=-2x/4x
=-1/2
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