满分5 >
初中数学试题 >
已知实数x,y满足方程(x2+2x+3)(3y2+2y+1)=,则x+y= .
已知实数x,y满足方程(x
2+2x+3)(3y
2+2y+1)=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164203803709604/SYS201310221642038037096018_ST/0.png)
,则x+y=
.
考点分析:
相关试题推荐
今有浓度分别为3%、8%、11%的甲、乙、丙三种盐水50千克、70千克、60千克,现要用甲、乙、丙这三种盐水配制浓度为7%的盐水100千克,则丙种盐水最多可用
千克.
查看答案
在平面直角坐标系中,点P的坐标是(
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164203803709604/SYS201310221642038037096016_ST/0.png)
+m,
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164203803709604/SYS201310221642038037096016_ST/1.png)
+n),这里m,n都是有理数,过点P作y轴的垂线,垂足为H,已知△OPH的面积为
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164203803709604/SYS201310221642038037096016_ST/2.png)
,其中O为坐标原点,则满足条件的有序数对(m,n)有
对.
查看答案
在凸四边形ABCD中,AD=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164203803709604/SYS201310221642038037096015_ST/0.png)
,AB+CD=2
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164203803709604/SYS201310221642038037096015_ST/1.png)
,∠BAD=60°,∠ADC=120°.M是BC的中点,则DM=
.
查看答案
已知a
2-a-1=0,且
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164203803709604/SYS201310221642038037096014_ST/0.png)
,则x=
.
查看答案
在梯形ABCD中,AB∥DC,AB=AC=AD=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164203803709604/SYS201310221642038037096013_ST/0.png)
,BC=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022164203803709604/SYS201310221642038037096013_ST/1.png)
,则BD=
.
查看答案