问题 解答题
计算下面各题,能简算的必须简算.
87×
3
86
24×(
3
8
+
1
6
+
5
12
)
1
3
÷5+
2
3
×
1
5
2
9
×0.375÷
6
7
2.4-2.4×
4
7
-
3
7
  
11.58-(7
5
11
+1.58)
答案

(1)87×

3
86

=(86+1)×

3
86

=86×

3
86
+1×
3
86

=3+

3
86

=3

3
86

(2)24×(

3
8
+
1
6
+
5
12
),

=24×

3
8
+24×
1
6
+24×
5
12

=9+4+10,

=23;

(3)

1
3
÷5+
2
3
×
1
5

=

1
3
×
1
5
+
2
3
×
1
5

=(

1
3
+
2
3
)×
1
5

=1×

1
5

=

1
5

(4)

2
9
×0.375÷
6
7

=

1
12
×
7
6

=

7
72

(5)2.4-2.4×

4
7
-
3
7

=2.4×(1-

4
7
)-
3
7

=2.4×

3
7
-
3
7

=

3
7
×(2.4-1),

=

3
7
×1.4,

=0.6;

(6)11.58-(7

5
11
+1.58),

=11.58-1.58-7

5
11

=10-7

5
11

=2

6
11

单项选择题
单项选择题