x-{y-2x+[3x-3(y+2x)+5y]},其中=2分之1,y=-1
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x-{y-2x+[3x-3(y+2x)+5y]},其中=2分之1,y=-1x-{y-2x+[3x-3(y+2x)+5y]},其中=2分之1,y=-1x-{y-2x+[3x-3(y+2x)+5y]},其
x-{y-2x+[3x-3(y+2x)+5y]},其中=2分之1,y=-1
x-{y-2x+[3x-3(y+2x)+5y]},其中=2分之1,y=-1
x-{y-2x+[3x-3(y+2x)+5y]},其中=2分之1,y=-1
x-{y-2x+[3x-3(y+2x)+5y]}
=x-{y-2x+[3x-3y-6x+5y]}
=x-{y-2x+3x-3y-6x+5y}
=x-y+2x-3x+3y+6x-5y
=6x-3y
=6*1/2-3*(-1)
=3+3
=6
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