题目内容
速算与巧算.
①35×37+45×37+20×37 | ②79×99+79. |
分析:(1)运用乘法分配律进行简算,
(2)把79×99+79化成79×99+79×1,然后运用乘法分配律进行简算.
(2)把79×99+79化成79×99+79×1,然后运用乘法分配律进行简算.
解答:解:(1)35×37+45×37+20×37,
=(35+45+20)×37,
=100×37,
=3700;
(2)79×99+79,
=79×99+79×1,
=79×(99+×1),
=79×100,
=7900.
=(35+45+20)×37,
=100×37,
=3700;
(2)79×99+79,
=79×99+79×1,
=79×(99+×1),
=79×100,
=7900.
点评:考查了乘法分配律的应用.
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速算与巧算.
①35×37+45×37+20×37 | ②79×99+79. |