83x41/42简便计算? 5
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①
83x41/42
=(84-1)x41/42
=(84x41-41)/42
【用42约分】
=2x41-41/42
=81又41/42
或②
83x41/42
=83x(42-1)/42
=(83x42-83)/42
=83-83/42
=83-1又41/42
=81又1/42
83x41/42
=(84-1)x41/42
=(84x41-41)/42
【用42约分】
=2x41-41/42
=81又41/42
或②
83x41/42
=83x(42-1)/42
=(83x42-83)/42
=83-83/42
=83-1又41/42
=81又1/42
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简算
83×41/42
=(84-1)×41/42
=84×41/42-41/42
=2×41-41/42
=82-41/42
=81又1/42
首先考虑运用凑整法化简分数,83凑成42的倍数,运用乘法分配律,进行运算。
83×41/42
=(84-1)×41/42
=84×41/42-41/42
=2×41-41/42
=82-41/42
=81又1/42
首先考虑运用凑整法化简分数,83凑成42的倍数,运用乘法分配律,进行运算。
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解:83x41/42
=(84一1)x41/42
=84x41/42一41/42
=2x41一41/42
=82一41/42
=81又1/42
=(84一1)x41/42
=84x41/42一41/42
=2x41一41/42
=82一41/42
=81又1/42
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83x41/42
=(84-1)×41/42
=82-41/42
=81又1/42.
=(84-1)×41/42
=82-41/42
=81又1/42.
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