搜狗做题网x-6y x*x-4y*y 2y x*x-2xy
来源：学生作业帮助网 编辑：作业帮 时间：2024/08/15 01:44:59
6x^2y+2xy-3x^2y^2-7x-5yx-4y^2x^2-6x^2y,=-7x^2y^2-3xy-7x其中|x+3|+(y-2)^2=0即x+3=0,y-2=0x=-3,y=2原式=-7*9*
已知等式变形得：（x+2）2+（y-3）2=0，则x+2=0，y-3=0，即x=-2，y=3，则yx=3-2=19．
方程x2+y2-4x+1=0表示以点（2，0）为圆心，以3为半径的圆．设yx=k，即y=kx，由圆心（2，0）到y=kx的距离为半径时直线与圆相切，斜率取得最大、最小值，由|2k−0|k2+1=3，解
∵x+y=4，xy=3，∴原式=x2+y2xy=(x+y)2−2xyxy=16−63=103．
∵x−yx+y=2，∴x-y=2（x+y），∴x−yx+y-2x+2yx−y=2(x+y)x+y-2(x+y)2(x+y)=2-1=1，故答案为：1．
2x+yx2-2xy+y2•(x-y)=2x+y(x-y)2•(x-y)（2分）=2x+yx-y；（4分）当x-3y=0时，x=3y；（6分）原式=6y+y3y-y=7y2y=72．（8分）
x=6-3y &nbs
3x^2y-3xy^2+6yx^2-9y^2x=3x^2y+6yx^2-3xy^2-9y^2x=9x^2y-12xy^2=3xy(3x-4y)
似乎题目应该是y=√(x-2)+√(2-x)+4x-2>=02-x>=0x=2代入得y=4yx=4*2=8y的x次=4²=16
（1）x=4代入,4+y=4y-2y;所以y=4（2）y=4代入,4+4=4x-2*4；所以x=4
|x+3|+(y-1/2）^2=0|x+3|=0,(y-1/2）^2=0x=-3y=1/26x^2y+2xy-3x^2y^2-7x-5yx-4y^2x^2-6x^2y=6x^2y-6x^2y+2xy-
xy+yx=10x+y+10y+x=11x+11y=100+x10x=100-11yx=10-1.1y所以y只能是0
∵x-y=4xy，∴2x+3xy-2yx-2xy-y=2(x-y)+3xyx-y-2xy=8xy+3xy4xy-2xy=112．故答案为：112．
X^2-4Y^2+3X-6Y=(X+2Y)(X-2Y)+3(X-2Y)=(X-2Y)(X+2Y+3)X^2+(X+1)^2+(X^2+X)^2=X^2+X^2＋2X＋1＋(X^2+X)^2=(X^2+
6x^2y+2xy-3x^2y^2-7x-5yx-4y^2x^2-6x^2y=6x^2y-6x^2y+2xy-5yx-3x^2y^2-4y^2x^2-7x=-3xy-7x^2y^2-7x
你抄错题了吧X2+Y2+5/4=2X+Y移项,得(X-1)2+(Y-1/2)2=0X=1,Y=1/2
解答如下：x+2y=(yx)/44x+8y=xyxy-8y=4x(x-8)y=4x当x≠8时(x=8不成立)y=4x/(x-8)x+2y=(2x+1)/32y=(2x+1)/3-x2y=(1-x)/3
6x²y+2xy-3x²y²-7x-5yx-4y²x²-6x²y|x+3|+(y+1/2)²=0x=-3y=1/2=-3xy-7x
化简：[(y²-x²)/(5x²-4yx)]/[(x+y)/(5x-4y)]原式=[(y+x)(y-x)/x(5x-4y)]×[(x+y)/(5x-4y)]=(y-x)/