limxy x^2 y^2 3
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移项、得1.5y=-3系数化为一、y=-2很简单的呀
4x−4y=3(1−y)+2①3x+2y=11②,由①得,y=4x-5③,③代入②得,3x+2(4x-5)=11,解得x=2111,把x=2111代入③得,y=4×2111-5=2911,所以,方程组
(1)2x-4y=63x+2y=17x=5y=1(2)3x+5y=53x-4y=23x=5y=-2(3)3x-y=05x-5y=-20x=2y=64)2x+y=2-x+y=5x=-1y=4(5)(y/
(x-y)(z+y-x+y+2y)÷4y=(x-y)(z-x+4y)÷4y{(x+y)(x-y)-(x-y)的2次方+2y(x-y)}除以4y=(x-y)(x+y-x+y+2y)÷4y=(x-y)(4
(x^2-y^2)/(x+y)-(4x(x-y)+y^2)/(2x-y)=(x-y)(x+y)/(x+y)-(4x^2-4xy+y^2)/(2x-y)=(x-y)-(2x-y)^2/(2x-y)=(x
移项后得到方程组3X+Y=-3X+Y=-1解得X=-1Y=0
x=2y;2y=3z;z+2x+3y=23;x=6;y=3;z=2;
y^4-(3y-2)^2=y^4-9y^29y^2=(3y-2)^23y=3y-23y=-(3y-2)无解y=1/3
[(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y=[x²-y²-x²-2xy-y²-xy+xy²]/(y/2)=[(x-2)y
1、2X-3Y=101)-4X+Y=52)1)×2+2)得4X-6Y-4X+Y=20+5-5Y=25Y=-5把Y=-5代入2)中,得-4X-5=5X=-5/2解得X=-5/2,Y=-52、3X-2Y=
如果是3组方程组,过程如下:3y=x+5(1)2x+5y=23(2)(1)*2得:6y=2x+10(3)(2)+(3)得:2x+5y+6y=23+2x+10求解得:y=3将y=3代入(1)式得:x=4
通分把把一个式子的X带入另一个式子的Y中即可解答这是这种问题的通常解法你给的分太少我就不做了
如果是3组方程组,过程如下:3y=x+5(1)2x+5y=23(2)(1)*2得:6y=2x+10(3)(2)+(3)得:2x+5y+6y=23+2x+10求解得:y=3将y=3代入(1)式得:x=4
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=
1,做出图像 求得A(-3,2)B(-1,-6)C(4,1) (y+7)/(x+4)即为(-4,-7)与三角形连线的斜率 斜率最大是为 EA最小为E
2y''+y'-y=0特征方程:2r^2+r-1=0根为:-1,1/2y=C1e^(-x)+C2e^(x/2)
x+2y+3z=1 ①2x+3y+z=2 &nb
∫[(sin1/y)/y^2]dy令u=1/ydu=(-1/y^2)dy原式=∫-sinudu=cosu+C=cos(1/y)+C
解(y^2+y-2)/(y^2+4y+4)=(y+2)(y-1)/(y+2)^2=(y-1)/(y+2)
x+2y+4y^2/(x-2y)=((x+2y)(x-2y))/(x-2y)+4y^2/(x-2y)=(x^2-4y^2)/(x-2y)+4y^2/(x-2y)=x^2/(x-2y)或者是你的题说的有