问题 解答题
(1)(
1
4
-
1
4
×99)÷
25
24

(2)
4
7
×
8
9
+
3
7
×
8
9

(3)(16×
3
8
+4)÷
2
7
答案

(1)(

1
4
+
1
4
×99)÷
25
24

=

1
4
×100×
24
25

=24;

(2)

4
7
×
8
9
+
3
7
×
8
9

=(

4
7
+
3
7
)×
8
9

=1×

8
9

=

8
9

(3)(16×

3
8
+4)÷
2
7

=(6+4)×

7
2

=10×

7
2

=35.

填空题
填空题