x-2y=-3 则5-2x+4y=?
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x-2y=-3 则5-2x+4y=?
x-2y=-3 则5-2x+4y=?
x-2y=-3 则5-2x+4y=?
5-2x+4y
=5-2(x-2y)
=5-2*(-3)
=5+6=11
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5
已知x*x+4x+y*y-2y+5=0,则x*x+y*y=?
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
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方程组4x+y=3 3x+2y=5,则x-y=
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
3X=5Y (X+Y)*3X=(2Y+X)*4+2*2
若3x-5y=0,则x+y/x=(),x-y/y=(),2x-3y/2x+3y=( )
2x-y/x+y=4,则4x-2y/2x+2y+3x+3y/2x-y
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
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()