题目内容

用简便方法计算.(写出主要过程)
3.625+2
1
13
+4
12
13
+0.375
1
4
×7
5
7
+0.25×3
2
7
(1)3.625+2
1
13
+4
12
13
+0.375,
=(3.625+0.375)+(2
1
13
+4
12
13
),
=4+7,
=11;

(2)
1
4
×7
5
7
+0.25×3
2
7

=0.25×7
5
7
+0.25×3
2
7

=0.25×(7
5
7
+3
2
7
),
=0.25×(10+1),
=2.5+0.25,
=2.75.
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