题目内容
仔细观察横线两边的算式,不计算,在横线里填入“>”、“<”或“=”.
(
-
)÷
÷
-
;
×2÷
×(2÷
);
÷2÷3
÷(2÷3);
99×
.
(
| 14 |
| 15 |
| 15 |
| 26 |
| 3 |
| 5 |
<
<
| 14 |
| 15 |
| 3 |
| 5 |
| 15 |
| 26 |
| 7 |
| 18 |
| 1 |
| 3 |
=
=
| 7 |
| 18 |
| 1 |
| 3 |
| 7 |
| 18 |
<
<
| 7 |
| 18 |
99×
| 15 |
| 65 |
<
<
99÷| 15 |
| 65 |
分析:(1)根据除法的性质(
-
)÷
=
÷
-
÷
,因为
÷
-
÷
<
÷
-
,所以填“<”;
(2)因为
×2÷
=
×2×3,
×(2÷
)=
×2×3,因此填“=”;
(3)因为
÷(2÷3)=
÷2×3,因此填“<”;
(4)99÷
=99×
,因为
<
,所以99×
<99÷
.
| 14 |
| 15 |
| 15 |
| 26 |
| 3 |
| 5 |
| 14 |
| 15 |
| 3 |
| 5 |
| 15 |
| 26 |
| 3 |
| 5 |
| 14 |
| 15 |
| 3 |
| 5 |
| 15 |
| 26 |
| 3 |
| 5 |
| 14 |
| 15 |
| 3 |
| 5 |
| 15 |
| 26 |
(2)因为
| 7 |
| 18 |
| 1 |
| 3 |
| 7 |
| 18 |
| 7 |
| 18 |
| 1 |
| 3 |
| 7 |
| 18 |
(3)因为
| 7 |
| 18 |
| 7 |
| 18 |
(4)99÷
| 15 |
| 65 |
| 65 |
| 15 |
| 15 |
| 65 |
| 65 |
| 15 |
| 15 |
| 65 |
| 15 |
| 65 |
解答:解:(
-
)÷
<
÷
-
;
×2÷
=
×(2÷
);
÷2÷3<
÷(2÷3);
99×
<99÷
.
故答案为:<,=,<,<.
| 14 |
| 15 |
| 15 |
| 26 |
| 3 |
| 5 |
| 14 |
| 15 |
| 3 |
| 5 |
| 15 |
| 26 |
| 7 |
| 18 |
| 1 |
| 3 |
| 7 |
| 18 |
| 1 |
| 3 |
| 7 |
| 18 |
| 7 |
| 18 |
99×
| 15 |
| 65 |
| 15 |
| 65 |
故答案为:<,=,<,<.
点评:此题不需要计算出结果,可通过算式变形,巧妙解答.
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