题目内容
| 用递等式计算. 5.25×3.6+6
|
8
| ||||||||||||
2
|
5.13×
| ||||||||||||
[1-(
|
5-
|
(1)5.25×3.6+6
×5
,
=5.25×3.6+6.4×5.25,
=5.25×(3.6+6.4),
=5.25×10,
=52.5;
(2)8
+5.25+1.2+
,
=8.8+5.25+1.2+5.75,
=(8.8+1.2)+(5.25+5.75),
=10+11,
=21;
(3)2
×[3.8÷(3-2.4×
)],
=2
×[3.8÷(3-2.24)],
=2
×[3.8÷0.76],
=
×5,
=12;
(4)5.13×
-4.63×0.6,
=5.13×0.6-4.63×0.6,
=(5.13-4.63)×0.6,
=0.5×0.6,
=0.3;
(5)[1-(
+
)]÷
,
=[1-
]×4,
=
×4,
=
;
(6)5-
×
-
,
=5-
-
,
=5-(
+
),
=5-1,
=4.
| 2 |
| 5 |
| 1 |
| 4 |
=5.25×3.6+6.4×5.25,
=5.25×(3.6+6.4),
=5.25×10,
=52.5;
(2)8
| 4 |
| 5 |
| 23 |
| 4 |
=8.8+5.25+1.2+5.75,
=(8.8+1.2)+(5.25+5.75),
=10+11,
=21;
(3)2
| 2 |
| 5 |
| 14 |
| 15 |
=2
| 2 |
| 5 |
=2
| 2 |
| 5 |
=
| 12 |
| 5 |
=12;
(4)5.13×
| 3 |
| 5 |
=5.13×0.6-4.63×0.6,
=(5.13-4.63)×0.6,
=0.5×0.6,
=0.3;
(5)[1-(
| 1 |
| 4 |
| 3 |
| 8 |
| 1 |
| 4 |
=[1-
| 5 |
| 8 |
=
| 3 |
| 8 |
=
| 3 |
| 2 |
(6)5-
| 7 |
| 8 |
| 40 |
| 49 |
| 2 |
| 7 |
=5-
| 5 |
| 7 |
| 2 |
| 7 |
=5-(
| 5 |
| 7 |
| 2 |
| 7 |
=5-1,
=4.
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