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(2002•三明)如果收入5元记作+5元,那么支出3元记作 元.
(2002•三明)如果收入5元记作+5元,那么支出3元记作 元.
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(2002•扬州)下列说法:①
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是有理数;②30476保留三个有效数字的近似值为3.05×10
4;③
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是最简二次根式;④直线y=-2x+3不经过第三象限.其中说法正确的有( )
A.1个
B.2个
C.3个
D.4个
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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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+3=0,设
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=y,则原方程可化为y+
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+3=0;
(2)若x+y=a,x-y=b,求2x
2+2y
2的值.用配方法求,2x
2+2y
2=(x+y)
2+(x-y)
2;
(3)若x
2-4x+4+
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=0,求x、y的值.用非负数的和为零解,则原式可以化为(x-2)
2+
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=0;
(4)四个全等的任意四边形的地砖,铺成一片可以不留空隙.
A.1个
B.2个
C.3个
D.4个
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(2002•西城区)如果关于x的方程2x
2-7x+m=0的两实数根互为倒数,那么m的值为( )
A.
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B.-
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C.2
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(2002•崇文区)下列计算结果正确的是( )
A.(-2)
2=4
B.2
-2=-4
C.(-2)
=0
D.
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=±3
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