问题 解答题
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
答案

(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.

填空题
单项选择题