题目内容
在横线里填上“>”、“<”或“=”
|
| ||||||||||||||||||
100×
|
|
(1)因为
×
+
=
+
=
,
×
=1,
所以
×
+
>
×
;
(2)因为
×(1+
)
=
×
=
,
×
×3
=
×3
=
,
所以
×(1+
)=
×
×3;
(3)因为100×
=(99+1)×
=7+
=7
,
99×
=(90+9)×
=7+
=7
,
所以100×
<99×
(4)因为
×(
-
)
=
×
=
,
×
×
=
×
=
,
所以
×(
-
)>
×
×
.
故答案为:>;=;<;>.
| 5 |
| 6 |
| 2 |
| 3 |
| 1 |
| 4 |
=
| 4 |
| 5 |
| 1 |
| 4 |
=
| 21 |
| 20 |
| 7 |
| 12 |
| 12 |
| 7 |
所以
| 5 |
| 6 |
| 2 |
| 3 |
| 1 |
| 4 |
| 7 |
| 12 |
| 12 |
| 7 |
(2)因为
| 1 |
| 5 |
| 1 |
| 2 |
=
| 1 |
| 5 |
| 3 |
| 2 |
=
| 3 |
| 10 |
| 6 |
| 5 |
| 1 |
| 12 |
=
| 1 |
| 10 |
=
| 3 |
| 10 |
所以
| 1 |
| 5 |
| 1 |
| 2 |
| 6 |
| 5 |
| 1 |
| 12 |
(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 |
| 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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