-8的相反数是 .
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古希腊著名的毕达哥拉斯学派把1,3,6,10…这样的数称为“三角形数”,而把1,4,9,16…这样的数称为“正方形数”.从图中可以发现,任何一个大于1的“正方形数”都可以看作两个相邻“三角形数”之和.下列等式中,符合这一规律的是( )
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A.13=3+10
B.25=9+16
C.36=15+21
D.49=18+31
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已知⊙O
1的半径为5cm,⊙O
2的半径为3cm,圆心距O
1O
2=2,那么⊙O
1与⊙O
2的位置关系是( )
A.相离
B.外切
C.相交
D.内切
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下列命题中,错误的是( )
A.矩形的对角线互相平分且相等
B.对角线互相垂直的四边形是菱形
C.等腰梯形的两条对角线相等
D.等腰三角形底边上的中点到两腰的距离相等
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正方形网格中,∠AOB如图放置,则sin∠AOB=( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022163109983889633/SYS201310221631099838896004_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022163109983889633/SYS201310221631099838896004_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022163109983889633/SYS201310221631099838896004_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022163109983889633/SYS201310221631099838896004_ST/2.png)
D.2
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如图是由相同小正方体组成的立体图形,它的左视图为( )
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A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022163109983889633/SYS201310221631099838896003_ST/images1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022163109983889633/SYS201310221631099838896003_ST/images2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022163109983889633/SYS201310221631099838896003_ST/images3.png)
D.
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