问题 解答题
计算下面各题能简算的要简算.
①(
6
7
-
5
6
)÷
1
42

7
10
×3+
3
10
÷
1
3

5
8
+
3
7
+
3
8
+
4
7

④3-
3
2
×
10
21
-
2
7
答案

①(

6
7
-
5
6
)÷
1
42

=(

6
7
-
5
6
)×42

=

6
7
×42-
5
6
×42

=36-35

=1;

7
10
×3+
3
10
÷
1
3

=

7
10
×3+
3
10
×3

=(

7
10
+
3
10
)×3

=1×3

=3;

5
8
+
3
7
+
3
8
+
4
7

=(

5
8
+
3
8
)+(
3
7
+
4
7

=1+1

=2;

④3-

3
2
×
10
21
-
2
7

=3-

5
7
-
2
7

=3-(

5
7
+
2
7

=3-1

=2.

单项选择题 A1/A2型题
问答题 简答题