已知a、b为两个连续整数,且
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160858568112935/SYS201310221608585681129010_ST/0.png)
,则a+b的值为
.
考点分析:
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若一次函数y=(m+1)x+m的图象过第一、三、四象限,则函数y=mx
2-mx( )
A.有最大值
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B.有最大值-
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C.有最小值
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D.有最小值-
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已知:如图,E(-4,2),F(-1,-1),以O为位似中心,相似比为
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,把△EFO缩小,则点E的对应点E′的坐标为( )
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A.(8,-4)
B.(8,-4)或(-8,4)
C.(2,-1)
D.(2,-1)或(-2,1)
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某县为发展教育事业,加强了对教育经费的投入,2007年投入3000万元,预计2009年投入5000万元.设教育经费的年平均增长率为x,根据题意,下面所列方程正确的是( )
A.3000(1+x)
2=5000
B.3000x
2=5000
C.3000(1+x%)
2=5000
D.3000(1+x)+3000(1+x)
2=5000
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同时投掷两枚普通的正方体骰子,所得两个点数之和大于9的概率是( )
A.
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如图,AB是⊙O的直径,CD是⊙O的弦,连接AC、AD,若∠CAB=35°,则∠ADC的度数为( )
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B.45°
C.55°
D.65°
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