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函数y=-3x2+3,当x 时,函数值y随x的增大而减小.当x 时,函数取得最 值,最 值y= .
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给出下列函数①y=-3x+2②y=3x③y=2x2④y=3x上述函数中符合条件当x>1时函数值y随
①③
③④
②④
②③
当x时二次函数y=2x2+12x+mm为常数的函数值y随x的增大而减小.
对函数y=-下列结论错误的为
当x>0时,y随x的增大而增大
当x<0时,y随x的增大而增大
x=1的函数值大于x=-1的函数值
在函数图像所在的每上象限内,y随x增大而增大
当时一次函数y=m+1x+6的函数值随x的增大而减小.
已知函数①y=0.2x+6②y=﹣x﹣7③y=4﹣2x④y=﹣x⑤y=4x⑥y=﹣2﹣x其中y的值随
对于二次函数y=x2-2mx-3有下列说法①它的图象与x轴有两个公共点②如果当x≤1时y随x的增大而
已知函数y=mx+2x-2要使函数值y随自变量x的增大而增大则m取值范围是____________.
根据下列条件求m的取值范围.函数y=m+3x2当x>0时y随x的增大而减小当x<0时y随x的增大而增
已知二次函数y=﹣x2+2x+31在如图所示的坐标系中画出该函数的图象2根据图象回答x取何值时y>0
若函数y=-4x2的函数值y随x的增大而减少则自变量x的取值范围是
x>0
x<0
x>4
x<-4
函数值y随x的增大而减小的是
y=1+x
y=
x-1
y=-x+1
y=-2+3x
已知二次函数a≠0的图象开口向上并经过点-1210.下列结论正确的是
当x>0时,函数值y随x的增大而增大
当x>0时,函数值y随x的增大而减小
存在一个负数x
0
,使得当x
0时,函数值y随x的增大而减小;当x> x
0
时,函数值y随x的增大而增大
存在一个正数x
0
,使得当x
0时,函数值y随x的增大而减小;当x>x
0
时,函数值y随x的增大而增大
函数y=x﹣12+3当x时函数值y随x的增大而增大.
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一次函数与正比例函数的图像图1所示则下列说法正确的是
它们的函数值y随x的增大而增大
它们的函数值y随x的增大而减小
它们的自变量x的取值为全体实数。
k<0
如图一个函数的图象由射线B
线段BC.射线CD组成,其中点A(-1,2),B(1,3),C(2,1),D(6,5),则此函数( )
A.当x<1时,y随x的增大而增大
当x<1时,y随x的增大而减小
当x>1时,y随x的增大而增大
当x>1时,y随x的增大而减小
一个二次函数解析式过点31当x>0时y随x增大而减小当x为2时函数值小于7请写出符合要求的二次函数解
对于函数y=-下列结论错误的是
当x>0时,y随x的增大而增大
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