若2x-3y=5,则6-4x+6y=急!~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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若2x-3y=5,则6-4x+6y=急!~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
若2x-3y=5,则6-4x+6y=
急!~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
若2x-3y=5,则6-4x+6y=急!~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
6-4x+6y=6-2(2x-3y)=6-2*5=-4
完毕.
若2x-3y=5,则6-4x+6y=急!~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
若5x+3y=3x+4y=x+2y+6,则x+y=___
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
若x+y=3,则x²-y²+6y=急
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