解:(1)8470-104×65
=8470-6760
=1710;
(2)1.3-3.79+9.7-6.21
=1.3+9.7-(3.79+6.21)
=11-10
=1;
(3)3.64÷4+4.36×0.25
=3.64×0.25+4.36×0.25
=(3.64+4.36)×0.25
=8×0.25
=2;
(4)(
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-
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)×4×9
=(
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-
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)×36
=
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×36-
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×36
=4-3
=1;
(5)
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÷[
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×(0.4+
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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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×
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]
=
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÷
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=
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;
故答案為1710;1;2;1;
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.
分析:(1)先算乘法,后算減法;
(2)可根據(jù)“a-b-c=a-(b+c)”這一規(guī)律進(jìn)行簡(jiǎn)便計(jì)算;
(3)可運(yùn)用乘法分配律進(jìn)行簡(jiǎn)便計(jì)算;
(4)可運(yùn)用乘法結(jié)合律和乘法分配律進(jìn)行簡(jiǎn)便計(jì)算;
(5)先把小數(shù)轉(zhuǎn)化成分?jǐn)?shù),再按運(yùn)算順序計(jì)算.
點(diǎn)評(píng):此題是考查四則混合運(yùn)算,計(jì)算時(shí)要看清數(shù)字和運(yùn)算符號(hào),根據(jù)算式特點(diǎn)靈活運(yùn)用一些運(yùn)算定律進(jìn)行簡(jiǎn)便計(jì)算.