计算下面各题,能简算的请用简便方法计算.
8.38+9.43+6.62????5.86-1.77+2.5447.2+8.6-7.2??????28.6-3.8-14.6-6.28-2.6-1.77????????7.4+0.93-4.3617.34-(9.8+6.34)0.93+5.45+7.07+4.55.
计算下面各题,能简算的请用简便方法计算.8.38+9.43+6.62????5.86-1.77+2.5447.2+8.6-7.2??????28.6-3.8-14.6
答案:2 悬赏:80 手机版
解决时间 2021-04-15 11:54
- 提问者网友:沉默的哀伤
- 2021-04-14 14:00
最佳答案
- 五星知识达人网友:风格不统一
- 2021-04-14 14:18
解:
(1)8.38+9.43+6.62,
=8.38+6.62+9.43,
=15+9.43,
=24.93;
(2)5.86-1.77+2.54,
=5.86+2.54-1.77,
=8.4-1.77,
=6.63;
(3)47.2+8.6-7.2,
=47.2-7.2+8.6,
=40+8.6,
=48.6;
(4)28.6-3.8-14.6-6.2,
=(28.6-14.6)-(3.8+6.2),
=14-10,
=4;
(5)8-2.6-1.77,
=5.4-1.77,
=3.63;
(6)7.4+0.93-4.36,
=8.33-4.36,
=3.97;
(7)17.34-(9.8+6.34),
=17.34-9.8-6.34,
=17.34-6.34-9.8,
=11-9.8,
=1.2;
(8)0.93+5.45+7.07+4.55,
=(0.93+7.07)+(5.45+4.55),
=8+10,
=18.解析分析:(1)根据加法交换律进行计算;
(2)根据加法交换律进行计算;
(3)根据加法交换律进行计算;
(4)根据加法交换律和结合律以及连减的性质进行计算;
(5)按照从左向右的顺序进行计算;
(6)按照从左向右的顺序进行计算;
(7)根据连减的性质进行计算;
(8)根据加法交换律和结合律进行计算.点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算律简便计算.
(1)8.38+9.43+6.62,
=8.38+6.62+9.43,
=15+9.43,
=24.93;
(2)5.86-1.77+2.54,
=5.86+2.54-1.77,
=8.4-1.77,
=6.63;
(3)47.2+8.6-7.2,
=47.2-7.2+8.6,
=40+8.6,
=48.6;
(4)28.6-3.8-14.6-6.2,
=(28.6-14.6)-(3.8+6.2),
=14-10,
=4;
(5)8-2.6-1.77,
=5.4-1.77,
=3.63;
(6)7.4+0.93-4.36,
=8.33-4.36,
=3.97;
(7)17.34-(9.8+6.34),
=17.34-9.8-6.34,
=17.34-6.34-9.8,
=11-9.8,
=1.2;
(8)0.93+5.45+7.07+4.55,
=(0.93+7.07)+(5.45+4.55),
=8+10,
=18.解析分析:(1)根据加法交换律进行计算;
(2)根据加法交换律进行计算;
(3)根据加法交换律进行计算;
(4)根据加法交换律和结合律以及连减的性质进行计算;
(5)按照从左向右的顺序进行计算;
(6)按照从左向右的顺序进行计算;
(7)根据连减的性质进行计算;
(8)根据加法交换律和结合律进行计算.点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算律简便计算.
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- 1楼网友:患得患失的劫
- 2021-04-14 15:40
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