西瓜经营户以2元/千克的价格购进一批小型西瓜,以3元/千克的价格出售,每天可售出200千克.为了促销,该经营户决定降价销售.经调查发现,这种小型西瓜每降价0.1元/千克,每天可多售出40千克.另外,每天的房租等固定成本共24元.该经营户要想每天盈利200元,应将每千克小型西瓜的售价降低多少元?
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用适当的方法解下列方程
(1)81x
2=5;
(2)64x
2-225=0;
(3)x
2-3x+2=0;
(4)x
2+8x=20.
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钟老师出示了小黑板上的题目(如图)后,小敏回答:“方程有一根为1”,小聪回答:“方程有一根为2”,则你认为( )
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A.只有小敏回答正确
B.只有小聪回答正确
C.小敏,小聪回答都正确
D.小敏,小聪回答都不正确
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已知关于x的一元二次方程(m-2)
2x
2+(2m+1)x+1=0有两个不相等的实数根,则m的取值范围是( )
A.m>
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B.m≥
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C.m>
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且m≠2
D.m≥
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且m≠2
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二元一次方程组
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的解是( )
A.
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B.
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C.
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D.
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下列方程中有实数根的是( )
A.x
2+2x+3=0
B.x
2+1=0
C.x
2+3x+1=0
D.
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