题目内容
用递等式计算(能简算的要简算)
(7001-3075)÷13×25
105×(
+
+
)
11.2-0.33+2.8-8.67
473÷2+473÷3+473÷6.
(7001-3075)÷13×25
105×(
| 1 |
| 7 |
| 2 |
| 3 |
| 1 |
| 5 |
11.2-0.33+2.8-8.67
473÷2+473÷3+473÷6.
(1)(7001-3075)÷13×25
=3926÷13×25,
=302×25,
=(300+2)×25,
=300×25+2×25,
=7550;
(2)105×(
+
+
)
=105×
+105×
+105×
,
=15+70+21,
=106;
(3)11.2-0.33+2.8-8.67
=11.2+2.8-(0.33+8.67),
=14-9,
=5;
(4)473÷2+473÷3+473÷6
=473×
+473×
+473×
,
=473×(
+
+
),
=473×1,
=473.
=3926÷13×25,
=302×25,
=(300+2)×25,
=300×25+2×25,
=7550;
(2)105×(
| 1 |
| 7 |
| 2 |
| 3 |
| 1 |
| 5 |
=105×
| 1 |
| 7 |
| 2 |
| 3 |
| 1 |
| 5 |
=15+70+21,
=106;
(3)11.2-0.33+2.8-8.67
=11.2+2.8-(0.33+8.67),
=14-9,
=5;
(4)473÷2+473÷3+473÷6
=473×
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 6 |
=473×(
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 6 |
=473×1,
=473.
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