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(2002•漳州)全校学生总数是n,其中女生占49%,则女生人数是 .
(2002•漳州)全校学生总数是n,其中女生占49%,则女生人数是 .
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(2002•济南)(1)用计算器探索:已知按一定规律排列的一组数:
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如果从中选出若干个数,使它们的和大于3,那么至少要选
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(2)如果数轴上的点A和点B分别代表-2、1,P是到点A或者点B距离为3的点,那么所有满足条件的点P到原点的距离之和为
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(2002•十堰)下列各题中解题方法或说法正确的个数有( )
(1)用换元法解方程
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+
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2+(x-y)
2;
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(2002•吉林)下列运算正确的是( )
A.2x
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3y
2B.(-x)
3•(-x)
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3)
2÷(-a
2)
3=1
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+3
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A.2a+a=3a
2B.
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(2002•乌鲁木齐)下列运算正确的是( )
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=a
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