(1)当x=____时,(√5-2x)/x在实数范围内有意义
(2)若两个正方形挂图的面积分别为44dm^2和99dm^2,则它们的面积比为:,边长比为:
(3)若直线y=kx+3与x轴,y轴分别交于A,B,AB=2√3,则k值为
(4)函数y=(√2x-3)+(√3-2x)+4中自变量x的取值范围是?y的值为?
人气:163 ℃ 时间:2020-02-03 11:37:01
解答
1 5-2x大于等于0 x小于等于5/2 且不等于0
2 4:9 2:3
3 3^2+ (-3/k)^2 =(2√3)^2 k=+ - √3
4 2x-3>=0 3-2x>=0 x只能=3/2 y=4
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