1.若2x-3y=0(y≠0)那么x/(x+y)若2x-3y=0(y≠0)那么x/(x+y)=_____________.已知1/x-1/y=3,则分式(2x+3xy-2y)/(x-2xy-y)的值为__________.若ab≠0,a^2-ab-6b^2=0,则b/a的值是________.
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