x+2y=1,2x-3y=2,
则2x+4y-6/2+6x-9y/4
=2(x+2y)-6/2+3(2x-3y)/4
=2*1-6/2+3*2/4
=-2+3/2
=-1/2
若x+2y=1,2x-3y=2,则2x+4y-6/2+6x-9y/4=?
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