数学题目初一
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1、原式<=>1/(X-2)+(X-1)/(X+1)=1/(X-2)+X/(X-2)
<=>(X-1)/(X+1)=X/(X-2)
<=>(X-1))(X-2)=X(X+1)
<=>X2-3X+2=X2+X
<=>-3X+2=X
<=>4X=2
<=>X=0.5
2、原式<=>X/(X-3)-2(X-3)]/(X-3)=k/(X-3)
<=>[X-2(X-3)]/(X-3)=k/(X-3)
<=>(-X+6)/(X-3)=K/(X-3)
=>增根X=3，且-X+6=k ，k=3
<=>(X-1)/(X+1)=X/(X-2)
<=>(X-1))(X-2)=X(X+1)
<=>X2-3X+2=X2+X
<=>-3X+2=X
<=>4X=2
<=>X=0.5
2、原式<=>X/(X-3)-2(X-3)]/(X-3)=k/(X-3)
<=>[X-2(X-3)]/(X-3)=k/(X-3)
<=>(-X+6)/(X-3)=K/(X-3)
=>增根X=3，且-X+6=k ，k=3
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