计算:(1)3-x/x-2÷{x-2-13-4x/x-2} (2){(1+4/a-2)(a-4+4/a)-3}÷(1/a
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计算:(1)3-x/x-2÷{x-2-13-4x/x-2} (2){(1+4/a-2)(a-4+4/a)-3}÷(1/a^2-1)
分式计算题,大哥大姐帮帮忙,
分式计算题,大哥大姐帮帮忙,
计算:
(1)(3-x)/(x-2)÷{x-2-(13-4x)/(x-2)}
=-(x-3)/(x-2)÷(x+3)(x-3)/(x-2)
=-(x-3)/(x-2)*(x-2)/(x+3)(x-3)
=-1/(x+3)
(2){(1+4/a-2)(a-4+4/a)-3}÷(1/a^2-1)
={(a+2)/(a-2)*(a-2)^2/a-3}*(a+1)(a-1)
=(a-4)(a-1)(a+1)^2/a
(1)(3-x)/(x-2)÷{x-2-(13-4x)/(x-2)}
=-(x-3)/(x-2)÷(x+3)(x-3)/(x-2)
=-(x-3)/(x-2)*(x-2)/(x+3)(x-3)
=-1/(x+3)
(2){(1+4/a-2)(a-4+4/a)-3}÷(1/a^2-1)
={(a+2)/(a-2)*(a-2)^2/a-3}*(a+1)(a-1)
=(a-4)(a-1)(a+1)^2/a
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