解:(1)(-12)×1=-12;
(2)-0.00125×(-
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),
=0.00125×
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,
=
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×
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,
=
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;
(3)-(-24)×|-6|,
=24×6,
=144;
(4)(-4)×(-8)-(-9)×
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,
=32+6,
=38;
(5)(-7)×(-0.35)×0=0;
(6)(-
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+
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-
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)×(-48),
=(-
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)×(-48)+
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×(-48)+(-
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)×(-48),
=8-36+4,
=12-36,
=-24;
(7)(-0.4)÷0.02,
=-(0.4÷0.02),
=-20;
(8)(-3
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)×(-2
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),
=
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×
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,
=
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;
(9)(-
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)÷(-16)÷(-2),
=(-
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)×(-
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)×(-
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),
=-
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×
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×
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,
=-
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.
分析:(1)負數(shù)與正數(shù)相乘得負數(shù);
(2)把小數(shù)化為分數(shù),約分計算,根據(jù)同號得正,異號得負,結果應為負數(shù);
(3)先求出-(-24)=24,然后根據(jù)負數(shù)的絕對值等于正數(shù),則|-6|=6;
(4)先算乘法,兩數(shù)相乘,同號得正,異號得負,再算減法;
(5)任何數(shù)和0相乘都得0;
(6)運用乘法分配律簡算,同時注意運算符號;
(7)先確定商的符號,再算0.4÷0.02;
(8)先確定積的符號:負負得正,再算3
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×2
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;
(9)先確定商的符號為負數(shù),把除法改為乘法,進行計算.
點評:此題考查了正負數(shù)的乘法和除法,在計算時,應根據(jù)乘法和除法法則進行.