(a-3)/(a^2-1)-2/(a+1)=(a-3)/(a+1)(a-1)-2(a-1)/(a+1)(a-1)=a-3-2(a-1)=a-3-2a+2=-a-1.(1)上述计算过程中,从哪一步开始出现错误的?(2)错误的原因是______________;(3)请你给出正确的解答.
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![(a-3)/(a^2-1)-2/(a+1)=(a-3)/(a+1)(a-1)-2(a-1)/(a+1)(a-1)=a-3-2(a-1)=a-3-2a+2=-a-1.(1)上述计算过程中,从哪一步开始出现错误的?(2)错误的原因是______________;(3)请你给出正确的解答.](/uploads/image/z/8844967-55-7.jpg?t=%28a-3%29%2F%28a%5E2-1%29-2%2F%28a%2B1%29%3D%28a-3%29%2F%28a%2B1%29%28a-1%29-2%28a-1%29%2F%28a%2B1%29%28a-1%29%3Da-3-2%28a-1%29%3Da-3-2a%2B2%3D-a-1.%EF%BC%881%EF%BC%89%E4%B8%8A%E8%BF%B0%E8%AE%A1%E7%AE%97%E8%BF%87%E7%A8%8B%E4%B8%AD%2C%E4%BB%8E%E5%93%AA%E4%B8%80%E6%AD%A5%E5%BC%80%E5%A7%8B%E5%87%BA%E7%8E%B0%E9%94%99%E8%AF%AF%E7%9A%84%3F%EF%BC%882%EF%BC%89%E9%94%99%E8%AF%AF%E7%9A%84%E5%8E%9F%E5%9B%A0%E6%98%AF______________%EF%BC%9B%EF%BC%883%EF%BC%89%E8%AF%B7%E4%BD%A0%E7%BB%99%E5%87%BA%E6%AD%A3%E7%A1%AE%E7%9A%84%E8%A7%A3%E7%AD%94.)
(a-3)/(a^2-1)-2/(a+1)=(a-3)/(a+1)(a-1)-2(a-1)/(a+1)(a-1)=a-3-2(a-1)=a-3-2a+2=-a-1.(1)上述计算过程中,从哪一步开始出现错误的?(2)错误的原因是______________;(3)请你给出正确的解答.
(a-3)/(a^2-1)-2/(a+1)=(a-3)/(a+1)(a-1)-2(a-1)/(a+1)(a-1)=a-3-2(a-1)=a-3-2a+2=-a-1.
(1)上述计算过程中,从哪一步开始出现错误的?
(2)错误的原因是______________;
(3)请你给出正确的解答.
(a-3)/(a^2-1)-2/(a+1)=(a-3)/(a+1)(a-1)-2(a-1)/(a+1)(a-1)=a-3-2(a-1)=a-3-2a+2=-a-1.(1)上述计算过程中,从哪一步开始出现错误的?(2)错误的原因是______________;(3)请你给出正确的解答.
(1)第二个等号后
(2)把分母忘记了
(3)
(a-3)/(a^2-1)-2/(a+1)=(a-3)/(a+1)(a-1)-2(a-1)/(a+1)(a-1)=[a-3-2(a-1)]/(a+1)(a-1)=(a-3-2a+2)/(a+1)(a-1)=(-a-1)/(a+1)(a-1)=-1/(a-1)希望能帮助你~
=a-3-2(a-1)出现错误
错去原因是把分母丢了
原式==(a-3)/(a+1)(a-1)-2(a-1)/(a+1)(a-1)
=[(a-3)-2(a-1)]/[(a+1)(a-1)]
=(a-3-2a+2)/[(a+1)(a-1)]
=-(a+1)/[(a+1)(a-1)=-1/(a-1)=1/(1-a)