试题:
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:

我来补答
(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
 
 
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