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A.2.4×10-7 B.2.4×10-8
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A.1.5×10-6¹ B.1.5×10-5¹
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(3)0.000000567;
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(4)0.000000301.
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B.2犪3+犪2=2犪5
C.(2犪5)2=4犪25
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=4犪4;
(3)狓4·狓5·(-狓)7+5(狓4)4-(狓7)3÷狓5.
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"#=狓4·狓5·(-狓7)+5狓16-狓21÷狓5
=-狓16+5狓16-狓16
=3狓16
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9./P<(犪-2)3-2犪=136,0犪#D,7. (B )
A.3�1�1.5 B.3�1.5
C.3�1 D.1�1.5
10.BC2狓=3,2狔=5,0①2
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5
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2狓+狔-1=
45
2
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11.!":(1)(-0.25)2021×24044= -4 ;
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×365=0.05=5×10-2(i),
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