下面各题,怎样简便怎样算.(1)884÷34+17×21 &...
下面各题,怎样简便怎样算.(1)884÷34+17×21(2)4.2÷1.5-1.5×0.6(3)13÷9+15÷9+17÷9(4)1593-[(44×19+4)÷5](...
下面各题,怎样简便怎样算.(1)884÷34+17×21 (2)4.2÷1.5-1.5×0.6(3)13÷9+15÷9+17÷9 (4)1593-[(44×19+4)÷5](5)104×0.25 (6)[(45?14)×611]÷920.
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(1)884÷34+17×21
=26+357
=383;
(2)4.2÷1.5-1.5×0.6
=2.8-0.9
=1.9;
(3)13÷9+15÷9+17÷9
=(13+15+17)÷9
=45÷9
=5;
(4)1593-[(44×19+4)÷5]
=1593-[(836+4)÷5]
=1593-[840÷5]
=1593-168
=1425;
(5)104×0.25
=(100+4)×0.25
=100×0.25+4×0.25
=25+1
=26;
(6)[(
?
)×
]÷
=[
×
]÷
=
×
=
.
=26+357
=383;
(2)4.2÷1.5-1.5×0.6
=2.8-0.9
=1.9;
(3)13÷9+15÷9+17÷9
=(13+15+17)÷9
=45÷9
=5;
(4)1593-[(44×19+4)÷5]
=1593-[(836+4)÷5]
=1593-[840÷5]
=1593-168
=1425;
(5)104×0.25
=(100+4)×0.25
=100×0.25+4×0.25
=25+1
=26;
(6)[(
4 |
5 |
1 |
4 |
6 |
11 |
9 |
20 |
=[
11 |
20 |
6 |
11 |
9 |
20 |
=
3 |
10 |
20 |
9 |
=
2 |
3 |
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