下列是最简分式的是:A.m-1\1-mB.xy-y\3xyC.x-y\x^2-y^2D.-61m\32m

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$下列是最简分式的是:A.m-1\1-mB.xy-y\3xyC.x-y\x^2-y^2D.-61m\32m$

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下列是最简分式的是:A.m-1\1-mB.xy-y\3xyC.x-y\x^2-y^2D.-61m\32m
下列是最简分式的是:
A.m-1\1-m
B.xy-y\3xy
C.x-y\x^2-y^2
D.-61m\32m

下列是最简分式的是:A.m-1\1-mB.xy-y\3xyC.x-y\x^2-y^2D.-61m\32m
B