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答案:
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1.(4)imx 1≠2
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2.3×1= 2×3= 4×1= 2×2=1×4= 4×3= 2×4= 3
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3.已知集合A={1, 2, 3},B={2, 3, 4},求A∩B:A、{1, 2}B、{1, 3}C、{2, 3}D、{1, 2, 3, 4}
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4.若f(x)=xA、f(1)<f(2)<f(4)B、f(4)<f(2)<f(1)C、f(2)<f(1)<f(4)D、f(2)<f(4)<f(1)
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5.0 1 2 3 4
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6.1)4 2(42 34
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7.已知α1=(1,1,2,2,1),α2=(0,2,1,5,-1),α3=(2,0,3,-1,3),α4=(1,1,0,4,-1), 则r(α1,α2,α3,α4)=____
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8.A.5 4 3 6 1 2B.4 5 3 1 2 6C.3 4 6 5 2 1D.2 3 4 1 5 6
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9.若有a=[1, 1, 2, 2, 3, 3, 4,4],执行a.remove(4)后列表a为
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10.计算:(1)-4.2 5.7-8.4 10=________;(2)-1/4 5/6 2/3-1/2=________;(3)12-(-18) (-7)-15=________;(4)4.7-(-8.9