解:(1)-2
2-|-3|
=-4-3
=-7;
(2)
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=1×5×5
=5×5
=25;
(3)12-(-18)+(-7)-15
=12+18-7-15
=30-22
=8;
(4)(-10)+8×(-2)
2-(-4)×(-3)
=-10+8×4-12
=-10+32-12
=10;
(5)(
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)÷
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=(
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)×12
=-
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×12+
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×12-
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×12
=-10+8-9
=-11;
(6)(-2)
3-2
2-(-1)
2004÷[(
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)]×6-|5|
=-8-4-1÷
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×6-5
=-8-4-36-5
=-53.
分析:(1)(4)(6)按照有理數(shù)混合運(yùn)算的順序,先乘方后乘除最后算加減,有括號(hào)的先算括號(hào)里面的;
(2)根據(jù)乘除混合運(yùn)算的順序和法則計(jì)算即可求解;
(3)根據(jù)加減混合運(yùn)算的順序和法則計(jì)算即可求解;
(5)運(yùn)用乘法的分配律計(jì)算.
點(diǎn)評(píng):本題考查的是有理數(shù)的運(yùn)算能力.注意:
(1)要正確掌握運(yùn)算順序,在混合運(yùn)算中要特別注意運(yùn)算順序:先三級(jí),后二級(jí),再一級(jí);有括號(hào)的先算括號(hào)里面的;同級(jí)運(yùn)算按從左到右的順序;
(2)去括號(hào)法則:--得+,-+得-,++得+,+-得-.