题目内容
6.7+4.95+3.3 | 283.75-(42.73-13.25) |
17.56-3.87-6.13 | 5.5+9.18+0.82+3.5 |
23.5+0.9+11.5 | 15.49-3.3-5.49. |
分析:(1)(4)(5)(6)运用加法交换律与结合律简算;
(2)运用加法的性质以及加法交换律与结合律简算;
(3)运用加法的性质简算.
(2)运用加法的性质以及加法交换律与结合律简算;
(3)运用加法的性质简算.
解答:解:(1)6.7+4.95+3.3
=(6.7+3.3)+4.95
=10+4.95
=14.95;
(2)283.75-(42.73-13.25)
=283.75-42.73+13.25
=(283.75+13.25)-42.73
=297-42.73
=254.27;
(3)17.56-3.87-6.13
=17.56-(3.87+6.13)
=17.56-10
=7.56;
(4)5.5+9.18+0.82+3.5
=(5.5+3.5)+(9.18+0.82)
=9+10
=19;
(5)23.5+0.9+11.5
=(23.5+11.5)+0.9
=35+0.9
=35.9;
(6)15.49-3.3-5.49
=(15.49-5.49)-3.3
=10-3.3
=6.7.
=(6.7+3.3)+4.95
=10+4.95
=14.95;
(2)283.75-(42.73-13.25)
=283.75-42.73+13.25
=(283.75+13.25)-42.73
=297-42.73
=254.27;
(3)17.56-3.87-6.13
=17.56-(3.87+6.13)
=17.56-10
=7.56;
(4)5.5+9.18+0.82+3.5
=(5.5+3.5)+(9.18+0.82)
=9+10
=19;
(5)23.5+0.9+11.5
=(23.5+11.5)+0.9
=35+0.9
=35.9;
(6)15.49-3.3-5.49
=(15.49-5.49)-3.3
=10-3.3
=6.7.
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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