大师作文网6y-y=3时y=多少
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移项、得1.5y=-3系数化为一、y=-2很简单的呀
|x|=3x=3或-3|y|=5y=5或-5|x-y|=|x|+|y||x|=3|y|=5|x|+|y|=8|x-y|=8x-y=8或-8由此可得y=5x=-3或y=-5x=3x+y=2或-2x-y=
第一个等式可得y=0,带入第二个公式可得x=7/2
3x-3=2y-33x=2yx=2y/3x-y/x+y=(y/3)/(5/3)=1/5
(2x-y)/(x+y)=3所以(x+y)/(2x-y)=1/3原式=1/2*(2x-y)/(x+y)+1/3*(x+y)/(2x-y)=3/2+1/9=29/18
3X+Y+6=0,X.Y互为相反数时X+Y=03X+Y+6=2X+(X+Y)+6=2X+6=0得X=-3Y=3
x^2-y^2=(x-y)(x+y)=5×6=30
2x-y\x+y=32x-y=3(x+y)2x-y=3x+3y3x-2x=-y-3yx=-4y2x-y/2x+2y+x+y/6x-3y=(-8y-y)/(-8y+2y)+(-4y+y)/(-24y-3
(5-3y)+2y=15-(7-5y)5-3y+2y=15-7+5y5-y=8+5y6y=-3y=-1/2很高兴为您解答,祝你学习进步!【the1900】团队为您答题.有不明白的可以追问!如果您认可我
6y-(y+2分之y+2-y分之y)除以y³-4y-2y²+8分之y=6y-[(2y-y²+2y+y²)/(4-y²)]÷y/(y-2)³=
3X=4Y两边除以3YX/Y=4/3(X-Y)/X=X/X-X/Y=1-4/3=-1/3
∵x=2,y=3∴2(xy^2+3y^3-x^2y)-(-2x^2y+y^3+xy^2)-4y^3=2xy²+6y³-2x²y+2x²y-y³-xy&
(1)因为X、Y互为相反数所以,X+Y=0(2)将X+Y=0带入(X+Y-3)（X-Y-2)=9得：-3（X-Y-2)=9解得：X-Y=-1（3）列出关于xy的方程组：X+Y=0X-Y=-1解得：X=
13y
(y^2-12)/y
x=8/3y=15/4就是这个了...
(x+2)^2-(y-3)^2=(x+y)*(x-y)x^2+4x+4-y^2+6y-9=x^2-y^24x+6y-5=0即为所求的方程
|x|+y=12,x+|y|=6x>=0时,x+y=12x+|y|=6,|y|-y=-6,无解x
(3y+5)/(3y-6)=1/2+(5y-4)/(2y-4)(3y+5)/(3y-6)-(5y-4)/(2y-4)=1/2(3y+5)/{3(y-2)}-(5y-4)/{2(y-2)}=1/2{2(