58×52+58×50-58×2

解:58×52+58×50-58×2,
=58×(52+50-2),
=58×100,
=5800.
分析:通過觀察,此題可運用乘法分配律進行簡算.
點評:注意觀察題目中數(shù)字構(gòu)成的特點和規(guī)律,善于靈活運用運算定律或運算技巧,巧妙解答.
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計算下面各題,怎樣簡便就怎樣算.
283×5+17×5                      25×33×4×2 2.6×78+78×7.4           
70-29.6-10.4 99×49+49               58×52-32×58.

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