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如图,在正方形ABCD的外侧作等边△ADE,则∠AEB的度数为( )
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A.10°
B.12.5°
C.15°
D.20°
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已知点P(1-m,2-n),如果m>1,n<2,那么点P在第( )象限.
A.一
B.二
C.三
D.四
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一次函数y=kx+b,当k>0,b<0时,它的图象是( )
A.
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B.
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C.
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D.
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已知a-2b=-2,则4-2a+4b的值是( )
A.0
B.2
C.4
D.8
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有理数a、b在数轴上的位置如图所示,则a+b的值( )
A.大于0
B.小于0
C.小于a
D.大于b
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