题目内容
【题目】(清原县)计算,能简算的要简算.
①36×101 ②239×7.2+956×8.2
③24×( ++)④3.7×0.58+6.3×0.58.
【答案】①3636;②9560;③12;④5.8
【解析】
试题分析:①36×101,将原式转化为:36×(100+1),再运用乘法分配律进行简算;
②239×7.2+956×8.2,根据积的变化规律,将原式转化为:239×7.2+239×32.8,再运用乘法分配律进行简算;
③24×( ++),运用乘法分配律进行简算;
④3.7×0.58+6.3×0.58.运用乘法分配律进行简算.
解答:解:①36×101,
=36×(100+1),
=36×100+36×1,
=3600+36,
=3636;
②239×7.2+956×8.2,
=239×7.2+239×32.8,
=239+(7.2+32.8),
=239×40,
=9560;
③24×( ++),
=24×+24×+24×,
=6+4+2,
=12;
④3.7×0.58+6.3×0.58.
=(3.7+6.3)×0.58,
=10×0.58,
=5.8.
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