题目内容

用递等式计算(能简算的要简算)
(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×(
1
7
+
2
3
+
1
5

=105×
1
7
+105×
2
3
+105×
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
+473×
1
3
+473×
1
6

=473×(
1
2
+
1
3
+
1
6
),
=473×1,
=473.
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