问题 填空题
在横线里填上“>”、“<”或“=”
6
5
×
2
3
+
1
4
______
7
12
×
12
7
1
5
×(1+
1
2
)
______
6
5
×
1
12
×3
100×
7
99
______99×
7
90
7
9
×(
2
3
-
2
7
)
______
5
9
×
9
10
×
1
2
答案

(1)因为

5
6
×
2
3
+
1
4

=

4
5
+
1
4

=

21
20

7
12
×
12
7
=1,

所以

5
6
×
2
3
+
1
4
7
12
×
12
7

(2)因为

1
5
×(1+
1
2

=

1
5
×
3
2

=

3
10

6
5
×
1
12
×3

=

1
10
×3

=

3
10

所以

1
5
×(1+
1
2
)=
6
5
×
1
12
×3;

(3)因为100×

7
99

=(99+1)×

7
99

=7+

7
99

=7

7
99

99×

7
90

=(90+9)×

7
90

=7+

7
10

=7

7
10

所以100×

7
99
<99×
7
90

(4)因为

7
9
×(
2
3
-
2
7

=

7
9
×
8
21

=

8
27

5
9
×
9
10
×
1
2

=

1
2
×
1
2

=

1
4

所以

7
9
×(
2
3
-
2
7
)>
5
9
×
9
10
×
1
2

故答案为:>;=;<;>.

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