问题 解答题
下面各题怎样简便怎样算.
6.13+28.86+13.87+1.14
12×97+1.2×3071÷60-68×
1
60
8.8×(3.75-1.25)×1.25
3
4
+
8
15
×
5
12
)÷
35
36
4
9
-
2
41
)×9×41.
答案

(1)6.13+28.86+13.87+1.14,

=(6.13+13.87)+(28.86+1.14),

=20+30,

=50;

(2)12×97+1.2×30,

=12×(97+3),

=12×100,

=1200;

(3)71÷60-68×

1
60

=(71-68)×

1
60

=3×

1
60

=0.05;

(4)8.8×(3.75-1.25)×1.25,

=[(8+0.8)×1.25]×2.5,

=[8×1.25+0.8×1.25]×2.5,

=[10+1]×2.5,

=10×2.5+1×2.5,

=25+2.5,

=27.5;

(5)(

3
4
+
8
15
×
5
12
)÷
35
36

=(

3
4
+
2
9
÷
35
36

=

3
4
×
36
35
+
2
9
×
36
35

=

27
35
+
8
35

=1;

(6)(

4
9
-
2
41
)×9×41,

=

4
9
×9×41-
2
41
×9×41,

=4×41-2×9,

=164-18,

=146.

单项选择题
单项选择题