题目内容
谁做得对,奖他(她)一面
.
(1)1
-
×
=1×
=
______
1
-
×
=1
-
=1
______
(2)72×
÷72×
=72×
×
=
______
72×
÷72×
=(72×
)÷(72×
)
=1
______.
(1)1
| 6 |
| 7 |
| 6 |
| 7 |
| 5 |
| 6 |
=1×
| 1 |
| 6 |
=
| 5 |
| 6 |
______
1
| 6 |
| 7 |
| 6 |
| 7 |
| 5 |
| 6 |
=1
| 6 |
| 7 |
| 5 |
| 7 |
=1
| 1 |
| 7 |
______
(2)72×
| 5 |
| 8 |
| 5 |
| 8 |
=72×
| 5 |
| 8 |
| 1 |
| 72 |
| 5 |
| 8 |
=
| 25 |
| 64 |
______
72×
| 5 |
| 8 |
| 5 |
| 8 |
=(72×
| 5 |
| 8 |
| 5 |
| 8 |
=1
______.
(1)1
-
×
,
=1
-
,
=1
;
(2)(2)72×
÷72×
,
=72×
×
×
,
=(72×
)×(
×
),
=1×=
.
=
.
故答案为:×,
,
,×.
| 6 |
| 7 |
| 6 |
| 7 |
| 5 |
| 6 |
=1
| 6 |
| 7 |
| 5 |
| 7 |
=1
| 1 |
| 7 |
(2)(2)72×
| 5 |
| 8 |
| 5 |
| 8 |
=72×
| 5 |
| 8 |
| 1 |
| 72 |
| 5 |
| 8 |
=(72×
| 1 |
| 72 |
| 5 |
| 8 |
| 5 |
| 8 |
=1×=
| 25 |
| 64 |
=
| 25 |
| 64 |
故答案为:×,
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