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在反比例函数
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图象的每一支曲线上,y都随x的增大而减小,则k的取值范围是
.
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如图,若△ABC∽△DEF,则∠D的度数为
.
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中百超市推出如下优惠方案:(1)一次性购物不超过100元,不享受优惠;(2)一次性购物超过100元,但不超过300元一律9折;(3)一次性购物超过300元一律8折.王波两次购物分别付款80元、252元,如果他将这两次所购商品一次性购买,则应付款( )
A.288元
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D.332元或363元
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如图,圆上有A,B,C,D四点,圆内有E,F两点且E,F在BC上.若四边形AEFD为正方形,则下列弧长关系,何者正确( )
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A.
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<
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B.
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=
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C.
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D.
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=
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