1/(6X-4Y)-1/(6X+4Y)+3X/(4Y^2-9X^2)=分式的加减

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1/(6X-4Y)-1/(6X+4Y)+3X/(4Y^2-9X^2)=分式的加减1/(6X-4Y)-1/(6X+4Y)+3X/(4Y^2-9X^2)=分式的加减1/(6X-4Y)-1/(6X+4Y)+

1/(6X-4Y)-1/(6X+4Y)+3X/(4Y^2-9X^2)=分式的加减
1/(6X-4Y)-1/(6X+4Y)+3X/(4Y^2-9X^2)=
分式的加减

1/(6X-4Y)-1/(6X+4Y)+3X/(4Y^2-9X^2)=分式的加减
=1/2(3x-2y)-1/2(3x+2y)-3x/(3x+2y)(3x-2y)
=(3x+2y)/2(3x+2y)(3x-2y) -(3x-2y)/2(3x+2y)(3x-2y)-6x/2(3x+2y)(3x-2y)
=(3x+2y-3x+2y-6x)/2(3x+2y)(3x-2y)
=-2(3x-2y)/2(3x+2y)(3x-2y)
=-1/(3x+2y)