①287×25×4?????????
②35×98????????????
③168×327+168×673
④125×64????????????
⑤125×15×4????????
⑥(1500-250-25)×2.
①287×25×4?????????②35×98????????????③168×327+168×673④125×64????????????⑤125×15×4???
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解决时间 2021-04-06 18:09
- 提问者网友:愿为果
- 2021-04-06 00:16
最佳答案
- 五星知识达人网友:拜訪者
- 2021-04-06 01:10
解:①287×25×4,
=287×(25×4),
=287×100,
=28700;
?????????
②35×98,
=35×(100-2),
=35×100-35×2,
=3500-70,
=3430;
③168×327+168×673,
=168×(327+673),
=168×1000,
=168000;
④125×64,
=125×(8×8),
=125×8×8,
=1000×8,
=8000;
??????????
⑤125×15×4,
=125×4×15,
=500×15,
=7500;
????????
⑥(1500-250-25)×2,
=1500×2-250×2-25×2,
=3000-500-50,
=2500-50,
=2450.解析分析:①运用乘法结合律简算;
②先把98分解成100-2,再运用乘法分配律简算;
③运用乘法分配律简算;
④先把64分解成8×8,再运用乘法结合律简算;
⑤运用乘法交换律简算;
⑥运用乘法分配律简算.点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
=287×(25×4),
=287×100,
=28700;
?????????
②35×98,
=35×(100-2),
=35×100-35×2,
=3500-70,
=3430;
③168×327+168×673,
=168×(327+673),
=168×1000,
=168000;
④125×64,
=125×(8×8),
=125×8×8,
=1000×8,
=8000;
??????????
⑤125×15×4,
=125×4×15,
=500×15,
=7500;
????????
⑥(1500-250-25)×2,
=1500×2-250×2-25×2,
=3000-500-50,
=2500-50,
=2450.解析分析:①运用乘法结合律简算;
②先把98分解成100-2,再运用乘法分配律简算;
③运用乘法分配律简算;
④先把64分解成8×8,再运用乘法结合律简算;
⑤运用乘法交换律简算;
⑥运用乘法分配律简算.点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
全部回答
- 1楼网友:爱难随人意
- 2021-04-06 02:23
和我的回答一样,看来我也对了
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