解:①(
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-
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)÷
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,
=
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×28-
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×28,
=16-6,
=10;
②0.5×2.5×12.5×64,
=(2.5×8)×(12.5×8)×0.5,
=20×100×0.5,
=1000;
③
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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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;
④4-
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-
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,
=4-(
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+
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),
=4-1,
=3;
⑤
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×58+42÷8,
=
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×58+42×
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,
=(42+58)×
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,
=12.5;
⑥36×(
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+
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-
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),
=36×
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+36×
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-36×
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,
=24+6-27,
=3.
分析:①把除以
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變成乘28,再利用乘法的分配律計(jì)算;
②把64變成8×8,利用乘法的結(jié)合律和分配律計(jì)算簡(jiǎn)便;
③按四則運(yùn)算順序從左到右依次計(jì)算;
④利用一個(gè)數(shù)連續(xù)減去兩個(gè)數(shù),等于這個(gè)數(shù)減去這兩個(gè)數(shù)的和計(jì)算簡(jiǎn)便;
⑤把42÷8變成42×
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,再利用乘法分配律計(jì)算;
⑥利用乘法分配律計(jì)算.
點(diǎn)評(píng):考查了運(yùn)算定律與簡(jiǎn)便運(yùn)算,四則混合運(yùn)算.注意運(yùn)算順序和運(yùn)算法則,靈活運(yùn)用所學(xué)的運(yùn)算律簡(jiǎn)便計(jì)算.