4x=3y,x:y=( ):( )
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4x=3y,x:y=( ):( )
4x=3y,x:y=( ):( )
4x=3y,x:y=( ):( )
4x=3y,x:y=(3 ):(4 )
=3:4
4x=3y,x:y=(3 ):(4 )
3;4
(x+y)/2- x-y/2=6 3(x+y)=4(x-y)
y(x+y)+(x-y)²-(x+y)(x-y),其中x=-1/3,y=3
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()
已知(x+y)2 =2,(x-y)3 =3,求(x+y)7(x-y)2(x+y)3(y-x)4 的值
y'=(y/x)^2+y/x+4微分方程
3x+y=2 -y/x+y=123x+y=2 (-y/x)+y=12
4x=3y,x:y=( ):( )
3(x+y)-4(x-y)=25
3x=4y,x、y成( )比例
2(x+y)-(x-3y)=13 4(x+y)+3(x-3y)=1解方程组 2(x+y)-(x-3y)=13 4(x+y)+3(x-3y)=1
已知X,Y满足x平方+y平方—4x+6y+13=0,求代数式(3x+y)的平方-3(3x-y)(x+y)-(x-3y)(x+3y)
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
x+2y=3(x+y)+5 3x-4y=4(x+y)-15
解方程组:2(x +y)-3(x-y)=3;4(x+ y)+ 3(x-y)=15
2(x+y)-(x-3y)=13,4(x+y)+3(x-3y)=1
已知XY.Y=-3,求-XY(X.X.X.Y.Y.Y.Y.Y.Y.Y-3.X.X.Y.Y.Y.Y.Y-Y)的值.(过程完整)
X×X-2XY-Y×Y+2X-2Y+2=02X×2X-4XY-2Y×2Y+3X-3Y+4=0X×X+2XY+Y×Y+X+Y-56=0X×X-2XY+Y×Y-X+Y-12=0X×X-3XY+Y×Y=-13X×3X-XY+3Y×3Y=13 两个在一起的方程之间有所联系(要求一步一步写出来)
如果A={(x,y)|x,y+2>0},B={(x,y)|2x+3y-6>0},C={(x,y)|x-4