题目内容
你认为怎样算简便就怎样算.
5400-2940÷28×27
27.98+0.5×0.3-18÷1.5
(
+
)÷
+
×67+26×
.
5400-2940÷28×27
27.98+0.5×0.3-18÷1.5
(
4 |
5 |
1 |
4 |
7 |
3 |
7 |
10 |
47 |
73 |
67 |
73 |
分析:(1)按运算顺序,先算除,再算乘,最后算减,进行计算即可;
(2)按运算顺序,先算乘,再算除,最后加减,进行计算即可;
(3)根据四则混合运算的运算顺序计算即可:先算乘除,再算加减,有括号的要先算括号里面的.
(4)可根据乘法分配律进行简算.
(2)按运算顺序,先算乘,再算除,最后加减,进行计算即可;
(3)根据四则混合运算的运算顺序计算即可:先算乘除,再算加减,有括号的要先算括号里面的.
(4)可根据乘法分配律进行简算.
解答:解:(1)5400-2940÷28×27
=5400-105×27,
=5400-2835,
=2565;
(2)27.98+0.5×0.3-18÷1.5
=27.98+0.15-18÷1.5,
=27.98+0.15-12,
=28.13-12,
=16.13;
(3)(
+
)÷
+
=
×
+
,
=
+
,
=
;
(4)
×67+26×
=
×47+26×
,
=(47+26)×
,
=73×
,
=67.
=5400-105×27,
=5400-2835,
=2565;
(2)27.98+0.5×0.3-18÷1.5
=27.98+0.15-18÷1.5,
=27.98+0.15-12,
=28.13-12,
=16.13;
(3)(
4 |
5 |
1 |
4 |
7 |
3 |
7 |
10 |
=
21 |
20 |
3 |
7 |
7 |
10 |
=
9 |
20 |
7 |
10 |
=
23 |
20 |
(4)
47 |
73 |
67 |
73 |
=
67 |
73 |
67 |
73 |
=(47+26)×
67 |
73 |
=73×
67 |
73 |
=67.
点评:完成时要注意分析算式中数据的特点及内在联系,运用合适的简便方法进行简便计算.
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