www95599cn官网:x^2/x-2+4/2-x =?
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等于什么要有过程
x^2(x-2)+4/(2-x)
=x^2/(x-2)-4/(x-2)
=(x^2-4)/(x-2)
=(x+2)(x-2)/(x-2)
=x+2
(x不等于2)
x^2/x-2+4/2-x =(x^2/x-x)+(4/2-2)=(x-x)+(2-2)=0
(x不等于0)
没有写清楚吧
应该是x^2/(x-2)+4/(2-x)吧
x^2/(x-2)+4/(2-x)
=x^2/(x-2)1-/(x-2)
=(x^2-4)/(x-2)
=(x+2)(x-2)/(x-2)
=x+2
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x^2/x-2+4/2-x =?
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