问题 解答题
计算(能简算的要简算)
1.2×5.5-0.45×12
5
9
×
3
7
+
4
9
÷
7
3
+
3
7

12÷(
3
4
+
1
6

2
7
+
7
8
×
5
7
+
3
8
)÷
3
4
答案

(1)1.2×5.5-0.45×12,

=1.2×5.5-4.5×1.2,

=(5.5-4.5)×1.2,

=1×1.2,

=1.2;

(2)

5
9
×
3
7
+
4
9
÷
7
3
+
3
7

=

5
9
×
3
7
+
4
9
×
3
7
+
3
7

=(

5
9
+
4
9
+1)×
3
7

=2×

3
7

=

6
7

(3)12÷(

3
4
+
1
6
),

=12÷

11
12

=12×

12
11

=

144
11

(4)(

2
7
+
7
8
×
5
7
+
3
8
)÷
3
4

=(

2
7
+
5
8
+
3
8
)÷
3
4

=[

2
7
+(
5
8
+
3
8
)]÷
3
4

=[

2
7
+1]÷
3
4

=

9
7
×
4
3

=

12
7

解答题
单项选择题 A1型题