若3x 4y 5=0,则x^2 y^2
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![若3x 4y 5=0,则x^2 y^2](/uploads/image/f/6960745-1-5.jpg?t=%E8%8B%A53x+4y+5%3D0%2C%E5%88%99x%5E2+y%5E2)
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))
解析x+y-1=0y=-3所以x=4x+y=1平方根是-1和1
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==>
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
/>由4x-3y=0得x/y=3/4所以(3x+4y):2y=3x/2y+4y/2y=3/2×3/4+2=9/8+2=25/8=25:8
∵2x-y>=0,y>=0∴y
2x-y-3=3x+2y+1=0,x=5/7,y=-11/7
x²+y²-4x-2y+5=0x²-4x+4+y²-2y+1=0(x-2)²+(y-1)²=0x-2=0x=2y-1=0y=1(x+y)/2
3X-3Y=2X+2YX=5YX/Y+Y/X=(XX+YY)/XY代入得26/5=5.2
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
16当x=4,y=1时3x+4y=3*4+4*1=12+4=16再问:…………为什么是“当x=4,y=1时”,线性规划么?再答:∵x+2y-5=02x+y-7=0的交点坐标是(3,1)∴可取的坐标是(
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!
由于(3x+y+6)^2和|x+y+2|都是非负数所以如果(3x+y+6)^2+|x+y+2|=0必有3x+y+6=0并且x+y+2=0所以2x=(3x+y+6)-(x+y+2)=-4所以x=-2
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
2(3x-2y)-(x-y)+(-x+9y)=展开得4x+6y=2(2x+3y)=2004*2=4008
X^2+3Y^2-12Y+12=0X^2+3(Y^2-4Y+4)=0X^2+3(Y-2)^2=0则X=0Y=2
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