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计算下面各题 怎样简便怎样计算.58÷57-34×89(16+421×710)÷38 17.
问题详情
参考答案
①58÷57-34×89,
=58×75-34×89,
=78-23,
=2124-1624,
=524;
②(16+421×710)÷38,
=(530+430)×83
=310×83,
=45;
③17.5-17.5÷2.5-3,
=17.5-7-3,
=7.5;
④2.92+5.6+4.4+1.08,
=(2.92+1.08)+(5.6+4.4),
=4+10,
=14;
⑤79×213+1113×79,
=79×(213+1113),
=79×1,
=79;
⑥720÷(8+4.5)÷8,
=720÷12.5÷8,
=720÷(12.5×8),
=720÷100,
=7.2;
考点: