不等式组
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的解集是
.
考点分析:
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如图,在△ABC中,BC=4,以点A为圆心,2为半径的⊙A与BC相切于点D,交AB于E,交AC于F,点P是⊙A上一点,且∠EPF=40°,则图中阴影部分的面积是( )
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A.4-
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B.4-
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C.8-
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D.8-
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某制药集团生产2万份甲型H1N1疫苗,生产2天后,该制药厂提高了生产速度,每天生产的疫苗数是原来的1.5倍,结果比原计划提前2天完成,那么原计划每天生产多少份疫苗?设原计划每天生产x份疫苗,下面列出的方程正确的是( )
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B.
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C.
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D.
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=4
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D.
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