若2x-3y-2=0,则x和y为
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若x平方-2xy+y平方-x+y-3=0求x-y的值(X-Y)(X-Y)-(X-Y)=3解下就可以了解之得:X-Y=1/2+根号13/2或者1/2-根号13/2已知实数x,y满足x平方+xy-y平方=
N={(1,1)},M={(x,y)|y-3=x-2},即M={(x,y)|y-x-1=0},CIM即为除直线外的所有的(x,y),CIN即为除(1,1)外的(x,y),所以(CIM)∩((CIM))
Dx^y+x^-y=2根号2===>(x^y+x^-y)^2=8===>x^2y+x^-2y+2=8===>x^2y+x^-2y=6(x^y-x^-y)^2=x^2y+x^-2y-2=6-2=4==>
x^2+y^2=6x-4y-17x^2+y^2-6x+4y+17=0(x-3)^2+(y+2)^2+4=0显然有问题呀!
设x/y=a,则y/x=1/a∵(2x-y)/3y=y/x∴2x/3y-1/3=y/x∴2a/3-1/3=1/a两边同时乘以3a2a²-a=3a²-a/2=3/2(a-1/4)
3x=4Y.X/Y=4/3,x-y)/y=(X/Y)-1=1/3,(3x+2y)/(2x+3y)=(4Y+2y)/(8/3y+3y)=18/17(因为3x=4Y,2x=8/3y)再问:若3X-4Y=0
很多数学符号,还是写出来方便.
|x+y-1|≥02(2x+y-3)²≥0x+y-1=2x+y-3=0x+y=12x+y=3x=2y=-1
∵2x-y>=0,y>=0∴y
2x-y-3=3x+2y+1=0,x=5/7,y=-11/7
3X+2Y=7.@2X+3Y=3.#将@式与#式相加得:5X+5Y=10,即X+Y=2将@式减去#式,得:X-Y=4因此,X+Y/X-Y=1/2
2x+y=2m-1①x+2y=m②①+②得3x+3y=3m-1x+y=m-1/3①-②得x-y=m-1∵x+y>0,x-y0,m-11/3,m
由2x-3y=0得:2x=3yx=3y/2把x=3y/2代入(x+y)/(x-y)=(3y/2+y)/(3y/2-y)=(5/2)/(1/2)=5选B由(x-2y)/(3y-x)=2/3得:2(3y-
∵|2x-y+5|+(x+2y-4)的平方=0∴2x-y+5=0,x+2y-4=0∴2x-y=-5,x+2y=4x-3y=-9则(2x-y)的三次方-(x-3y)(y-2x)的平方=(-5)^3-(y
3x-5y=0,则x+y/x=(8/5),x-y/y=(2/3),2x-3y/2x+3y=(1/19)因为3x-5y=0所以3x=5y设x=5,y=3,可以解得3x-5y=0,则x+y/x=(8/5)
天啊,小朋友很简单因为x,y相反数,所以,2x,2y就抵消了,3x/y呢,就变成了-3,5-3=2,所以等于2
-5|x-2y|≥08|y-1\2|≥0而-5|x-2y|+8|y-1\2|=0所以-5|x-2y|=08|y-1\2|=0x-2y=0y-1/2=0解得x=1y=1/2
若(x-y)/(x+y)=3那么x-y=3(x+y)x-y=3x+3y故x=-2y所以(x+2y)/(6x-7y)=(-2y+2y)/(6*(-2y)-7y)=0如果不懂,请Hi我,祝学习愉快!
x(x*x-1)+x(5-x*x)-6y+7=-x+5x-6y+7=2(2x-3y)+7=2*(-4)+7=-8+7=-1再问:能在写详一点吗-x+5x-6y+7再答:x(x*x-1)+x(5-x*x
xy均为线段,所以xy均不为0,设2x-3y=0或3x+2y=0,解得x/y=3/2或x/y=-2/3再问:是满足这个条件2x-3x]*[3x+2y]=0再答:是的