(1)计算:a-(a^2)/(a+1)-1 (2)计算:3x/(x-4y)+(x+y)/(4y-x)-7y/(x-4y)(3)计算:x(2-1/x)+x/x^2-2x*(x^2-4)(4)计算:(x-3)/(2x-4)÷(5/x-2--2)(5)计算:m/m+3-6/9-m^2÷2/m-3(6)计算:(3a/a-3-a/a+3)*a^2-9/a
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