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(2004•武汉)甲、乙两个个队完成某项工程,首先是甲单独做了10天,然后乙队加...
(2004•武汉)甲、乙两个个队完成某项工程,首先是甲单独做了10天,然后乙队加入合做,完成剩下的全部工程,设工程总量为单位1,工程进度满足如图所示的函数关系,那么实际完成这项工程所用的时间比由甲单独完成这项工程所需时间少( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230651759839272/SYS201310212306517598392008_ST/images0.png)
A.12天
B.13天
C.14天
D.15天
考点分析:
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下列问题中,解答错误的是( )
A.计算:(-a
2)
3=-a
6B.因式分【解析】
m
3-m=m(m+1)(m-1)
C.化简:(a
2-3ab+a)÷a=a-3b+1
D.计算:(a+b)
2=a
2+b
2
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