若2x-3y=5,则7-4x+6y=?
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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5x+3y=3x+4y=x+2y+6,则x+y=___
把(x-y)看作一个整体,化解:5(x-y)+2(x-y)-4(x-y)= 3(x-y)把(x-y)看作一个整体,化解:5(x-y)+2(x-y)-4(x-y)=3(x-y)²-4(x-y)+7(x-y)-6(x-y)²=
把(x-y)看做一个整体,合并同类项5(x-y)+2(x-y)-4(x-y)=3(x-y)次方-4(x-y)+7(x-y)-6(x-y)次方=
若(2X+3y)=4则7(2x+3y)-5(2x+3y)-4(2x=3y)的值为( ) 若(X+Y)=2则7(X+Y)-6(X+Y)-4(X+Y)+5(x+y)=( )
初二上学期方程题 4x+y=5 5x+4y=63x-2y=1 2x+3y=13x-2y=7 7x+5y=32x+3y=17 2x-y=-4x+5y=6 2x+y=23x-6y=4 3x+2y=52x+y=73x-4y=53x+y=1x-2y=-1x+y=42x+3y=92x-3y=74x+5y=3x+y=20004x+6y=90003x+5y=113x-2y=42x+3y=215x-2y=5x+y=54x+3y=182x+3y=16x+4y=132x+3y=40x
大括号x+y/2+x-y/3=11/6 4(x+y)-5(x-y)=7 快
若x/y=4/3 则3x+2y/2x-5y=
已知|5x-y-8|+(7y-x+2)=0则4x+6y
若7x+6(x-y)=-4,3x-4(y-x)=18,则x-y=__
3x+5y-(x+y)=6 2(x+y)-3x=-7
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
若x+y=4,则多项式1/2(x+y)+4(x-y)-3(x-y)-3/2(x+y)-x+y值是()
若x-2y=5,则式子12-x+2y=.以知3x-4y=2x+y则x∶y=
3x+2=y 5x+4=y 7x+6=y 9x+8=y 11x=y 联立方程 有的话
3x+2=y 5x+4=y 7x+6=y 9x+8=y 11x=y
3x+2=y 5X+4=Y 7X+6=Y 9X+8=y 11x=y要如何计算