问题 解答题
计算下面各题,能用简便方法的就用简便方法
99×
97
98

24×(
7
8
+
3
2
-
3
4

1
6
×
2
3
÷(
4
5
-
8
15
)
4
9
÷
4
5
-(
1
5
-
1
3
1-(
1
4
+
3
8
)÷
1
4
35
8
×
5
7
+
2
7
÷
8
35
答案

(1)99×

97
98

=(98+1)×

97
98

=98×

97
98
+1×
97
98

=97+

97
98

=97

97
98

(2)24×(

7
8
+
3
2
-
3
4
),

=24×

7
8
+24×
3
2
-24×
3
4

=21+36-18,

=39;

(3)

1
6
×
2
3
÷(
4
5
-
8
15
),

=

1
9
÷
4
15

=

1
9
×
15
4

=

5
12

(4)

4
9
÷
4
5
-(
1
5
-
1
3
),

=

4
9
×
5
4
-
1
5
+
1
3

=

5
9
+
1
3
-
1
5

=

31
45

(5)1-(

1
4
+
3
8
)÷
1
4

=1-

5
8
×4,

=1-

5
2

=-

3
2

(6)

35
8
×
5
7
+
2
7
÷
8
35

=

35
8
×
5
7
+
2
7
×
35
8

=

35
8
×(
5
7
+
2
7
),

=

35
8
×1,

=

35
8

单项选择题
单项选择题