若圆(x-1)² (y 1)²=4有且只有三个点
来源:学生作业帮助网 编辑:作业帮 时间:2024/05/09 10:31:23
y1=y2可得:2x平方-3x+1=4x平方+4x+7移项并合并同类项得:2x平方+7x+6=0分解因式得(x=2)(2x+3)=0可得x1=-2;x2=-3/2所以可知x=-2或-3/2时,y1=y
(1)、y1=y2=3x+2=4-x解得x=0.5(2)、y1-y2=3x+2-4+x=4解得x=1.5
由{y=1/2x-2{y=-x+1可得1/2x-2=-x+1即x=2则y=-1所以{y=1/2x-2{y=-x+1的解是{x=2{y=-1画图后可看出:当x>2时,y1>y2当x<2时,y1
把两点坐标代入y=x^2+x+b^2,得方程组a^2+a+b^2=-1/4a^2-a+b^2=m(a+1/2)^2=-b^2=>b=0,a=-1/2m=a^2-a+b^2=1/4+1/2+0=3/4m
设y2=ax把(2,2)代入得a=1y2=x设y1=b/x把(2,4)代入得b=8y1=8/x当x=√3时,y1=√3y2=8√3/3
已知y1=3(5/3x-1/2),y2=4(1/2-x)当x取何值时,y1=y2,当x取何值时,y1比y2大4?y1=y2>2-54-2b^2-4ac=169-4*8*10=169-320=-151故
y1=y2=>a^(x^2-2x+3)=a^(2x^2+4x+3)=>x^2-2x+3=2x^2+4x+3=>x=0,x=-6------------------------------y1>y2=>
1、即-2/3x+1=x5/3x=1x=3/52、即-2/3x+1=x-45/3x=5x=3
y1=y2-2/3x+1=x2/3x+x=15/3x=1x=3/5y1=y2-5-2/3x+1=x-52/3x+x=1+55/3x=6x=18/5
(1)根据题意得:-23x+1=x,去分母得:-2x+3=3x,移项合并得:5x=3,解得:x=35;(2)根据题意得:-23x+1=x-4,去分母得:-2x+3=3x-12,移项合并得:5x=15,
即y1+y2=0所以1/5x+1+(2x+1)/4=0两边乘204x+20+10x+5=014x=-25x=-25/14
/>(1)y1>y2|x|>x/3+4/3当x≥0时x>x/3+4/33x>x+42x>4x>2当xx/3+4/3-3x>x+4-4>4xx2,x
(1)4x-5=0x=5/4当x取5/4时,函数y1的值等于0.(2)2x+1<0x<-1/2当x小于-1/2时,函数y2的值恒小于0.(3)2x+1≥4x-52x≤6x≤3当x小于等于3时,函数y2
解题思路:解方程kx-1=x²,可得x1,y1,x2,y2,代入到等式y2/x1+y1/x2=18中求出k解题过程:
设y1=k1x−1,y2=k2x+2,∴y=k1x−1+k2x+2,把x=1,y=1;x=2,y=1,别代入上式得1=k231=k1+k24,(1分)解之得k1=14,k2=3,(2分)∴y=14x−
(1)写出它们图像的交点坐标;-x=x+4,x=-2即交点坐标是(-2,2)(2)当x为何值时,y1>y2?-x>x+42x再问:我要图哦,告诉我图画过哪几个点再答:y1=-x过(0,0)和(-2,2
1.y1=y2:-x+2=3x+4=>4x=-2=>x=-1/2y1-1/2y1>y2:-x+2>3x+4=>xx=1y=1带入y=ax+7=>a=-6
(1)当x≥0时,由y1>y2得:x>1/3x+3/42/3x>3/4∴x>9/8(2)当x<0时,由y1>y2得:﹣x<1/3x+3/4﹣4/3x<3/4∴x>﹣9/16∴﹣9/16<x<0
若y1=y2那么a^(2x-7)=a^(4x-1)∴2x-7=4x-1解得:x=-3∴x=-3时,y1=y2若y1>y2那么a^(2x-7)>a^(4x-1)当a>1时,y=a^x为增函数∴2x-7>
y1=y22x+1=5x+16-3x=15x=-5y1>y22x+1>5x+16-3x>15x>-5y1