题目内容
下面各题,怎么简便就怎么算. 637-198 |
797+436 | 327-96-104 |
267+33+109 | 500÷25×4 | 375-125+25 |
分析:①把198看做200-2带入,结果等于637-200+2;
②把797看做800-3带入,结果等于800+436-3;
③采用减法的简便计算方法,化成327-(96+104);
④⑤按照运算规则,从左向右,依次计算;
⑥采用减法的简便计算方法,化成375-(125-25);即可得解.
②把797看做800-3带入,结果等于800+436-3;
③采用减法的简便计算方法,化成327-(96+104);
④⑤按照运算规则,从左向右,依次计算;
⑥采用减法的简便计算方法,化成375-(125-25);即可得解.
解答:解:①637-198
=637-200+2
=437+2
=439;
②797+436
=(800-3)+437
=800+437-3
=1237-3
=1234;
③327-96-104
=327-(96+104)
=327-200
=127;
④267+33+109
=300+109
=409;
⑤500÷25×4
=20×4
=80;
⑥375-125+25
=375-(125-25)
=375-100
=275.
=637-200+2
=437+2
=439;
②797+436
=(800-3)+437
=800+437-3
=1237-3
=1234;
③327-96-104
=327-(96+104)
=327-200
=127;
④267+33+109
=300+109
=409;
⑤500÷25×4
=20×4
=80;
⑥375-125+25
=375-(125-25)
=375-100
=275.
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.

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