题目内容
用简便方法计算. (4+10)×25 |
36×57+64×57 | 17×39+17×31 | 34×301 |
分析:利用乘法分配律逐一进行简算即可.
解答:解:(1)(4+10)×25
=4×25+10×25
=100+250
=350;
(2)36×57+64×57
=(36+64)×57
=100×57
=5700;
(3)17×39+17×31
=17×(39+31)
=17×70
=1190;
(4)34×301
=34×300+34×1
=10200+34
=10234.
=4×25+10×25
=100+250
=350;
(2)36×57+64×57
=(36+64)×57
=100×57
=5700;
(3)17×39+17×31
=17×(39+31)
=17×70
=1190;
(4)34×301
=34×300+34×1
=10200+34
=10234.
点评:此题主要考查乘法分配律的运用,注意算式的特点,正确运用运算定律简算.
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