初一分式加减1.2/(x-1)-(x+1)/(x-1)2.2a/(a^-4)-1/(a-2)3.3x/(x-3)^2+x
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初一分式加减
1.2/(x-1)-(x+1)/(x-1)
2.2a/(a^-4)-1/(a-2)
3.3x/(x-3)^2+x/(x-3)
4.【2a/(x-2)-x(x+2)】*(x^2-4)/x
1.2/(x-1)-(x+1)/(x-1)
2.2a/(a^-4)-1/(a-2)
3.3x/(x-3)^2+x/(x-3)
4.【2a/(x-2)-x(x+2)】*(x^2-4)/x
![初一分式加减1.2/(x-1)-(x+1)/(x-1)2.2a/(a^-4)-1/(a-2)3.3x/(x-3)^2+x](/uploads/image/z/17384932-28-2.jpg?t=%E5%88%9D%E4%B8%80%E5%88%86%E5%BC%8F%E5%8A%A0%E5%87%8F1.2%2F%28x-1%29-%28x%2B1%29%2F%28x-1%292.2a%2F%28a%5E-4%EF%BC%89-1%2F%EF%BC%88a-2%EF%BC%893.3x%2F%28x-3%29%5E2%2Bx)
1.2/(x-1)-(x+1)/(x-1)
=[2-(x+1)]/(x-1)
=(-x+1)/(x-1)
=-(x-1)/(x-1)
=-1
2.2a/(a^2-4)-1/(a-2)
=2a/(a+2)(a-2)-(a+2)/(a+2)(a-2)
=(2a-a-2)/(a+2)(a-2)
=(a-2)/(a+2)(a-2)
=1/(a+2)
3.3x/(x-3)^2+x/(x-3)
=3x/(x-3)^2+x(x-3)/(x-3)^2
=(3x+x^2-3x)/(x-3)^2
=x^2/(x-3)^2
4.【2x/(x-2)-x(x+2)】*(x^2-4)/x
错了
【2x/(x-2)-x/(x+2)】*(x^2-4)/x
=x{[2(x+2)-(x-2)]/(x+2)(x-2)}*[(x+2)(x-2)/x]
=2(x+2)-(x-2)
=2x+4-x+2
=x+6
=[2-(x+1)]/(x-1)
=(-x+1)/(x-1)
=-(x-1)/(x-1)
=-1
2.2a/(a^2-4)-1/(a-2)
=2a/(a+2)(a-2)-(a+2)/(a+2)(a-2)
=(2a-a-2)/(a+2)(a-2)
=(a-2)/(a+2)(a-2)
=1/(a+2)
3.3x/(x-3)^2+x/(x-3)
=3x/(x-3)^2+x(x-3)/(x-3)^2
=(3x+x^2-3x)/(x-3)^2
=x^2/(x-3)^2
4.【2x/(x-2)-x(x+2)】*(x^2-4)/x
错了
【2x/(x-2)-x/(x+2)】*(x^2-4)/x
=x{[2(x+2)-(x-2)]/(x+2)(x-2)}*[(x+2)(x-2)/x]
=2(x+2)-(x-2)
=2x+4-x+2
=x+6
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