计算:2/1-m-1/m-1.2x/x-y -y/y-x -y-2x/x-y.12/m²-9 -2/m-3

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计算:2/1-m-1/m-1.2x/x-y -y/y-x -y-2x/x-y.12/m²-9 -2/m-3
计算:2/1-m-1/m-1.2x/x-y -y/y-x -y-2x/x-y.12/m²-9 -2/m-3

计算:2/1-m-1/m-1.2x/x-y -y/y-x -y-2x/x-y.12/m²-9 -2/m-3
2/(1-m)-1/(m-1)
=2/(1-m)+1/(1-m)
=3/(1-m)
2x/(x-y )-y/(y-x) -(y-2x)/(x-y)
2x/(x-y)+y/(x-y)-(y-2x)/(x-y)
=(2x+y-y+2x)/(x-y)
=4x/(x-y)
12/(m²-9 )-2/(m-3)
=12/(m-3)(m+3)-2/(m-3)
=12/(m-3)(m+3)-2(m+3)/(m-3)(m+3)
=(12-2m-6)/(m-3)(m+3)
=(6-2m)/(m-3)(m+3)
=-2(m-3)/(m-3)(m+3)
=-2/(m+3)