91+89+11??????????????
115+41+85??????????????
157+250+43
324+75+46+25+54?????????????????
415+217+35+83.
91+89+11??????????????115+41+85??????????????157+250+43324+75+46+25+54?????????????
答案:2 悬赏:0 手机版
解决时间 2021-04-12 11:32
- 提问者网友:感性作祟
- 2021-04-12 04:57
最佳答案
- 五星知识达人网友:往事埋风中
- 2021-04-12 06:25
解:(1)91+89+11,
=91+(89+11),
=91+100,
=191;
(2)115+41+85,
=(115+85)+41,
=200+41,
=241;
(3)157+250+43,
=(157+43)+250,
=200+250,
=450;
(4)324+75+46+25+54,
=324+(75+25)+(46+54),
=324+100+100,
=424+100,
=524;
(5)415+217+35+83,
=(415+35)+(217+83),
=450+300,
=750.解析分析:运用加法的运算定律进行解答即可.点评:此题考查了整数加法的运算定律的灵活运用.
=91+(89+11),
=91+100,
=191;
(2)115+41+85,
=(115+85)+41,
=200+41,
=241;
(3)157+250+43,
=(157+43)+250,
=200+250,
=450;
(4)324+75+46+25+54,
=324+(75+25)+(46+54),
=324+100+100,
=424+100,
=524;
(5)415+217+35+83,
=(415+35)+(217+83),
=450+300,
=750.解析分析:运用加法的运算定律进行解答即可.点评:此题考查了整数加法的运算定律的灵活运用.
全部回答
- 1楼网友:举杯邀酒敬孤独
- 2021-04-12 07:22
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