题目内容
能简便的要用简便计算
|
| 101×
| ||||||||||||||
72×(
| 73×
| 57×
|
(1)
-
×
=
-
,
=
;
(2)
×
×
×8
=
×8×(
×
),
=
×2,
=
;
(3)101×
=(100+1)×
,
=100×
+
,
=76+
,
=76
;
(4)72×(
+
)
=72×
+72×
,
=56+45,
=101;
(5)73×
-
=(73-1)×
,
=72×
,
=14;
(6)57×
+
=(57+1)×
,
=58×
,
=24.
| 7 |
| 8 |
| 5 |
| 8 |
| 4 |
| 5 |
=
| 7 |
| 8 |
| 4 |
| 8 |
=
| 3 |
| 8 |
(2)
| 7 |
| 24 |
| 6 |
| 13 |
| 13 |
| 3 |
=
| 7 |
| 24 |
| 6 |
| 13 |
| 13 |
| 3 |
=
| 7 |
| 3 |
=
| 14 |
| 3 |
(3)101×
| 19 |
| 25 |
=(100+1)×
| 19 |
| 25 |
=100×
| 19 |
| 25 |
| 19 |
| 25 |
=76+
| 19 |
| 25 |
=76
| 19 |
| 25 |
(4)72×(
| 7 |
| 9 |
| 5 |
| 8 |
=72×
| 7 |
| 9 |
| 5 |
| 8 |
=56+45,
=101;
(5)73×
| 7 |
| 36 |
| 7 |
| 36 |
=(73-1)×
| 7 |
| 36 |
=72×
| 7 |
| 36 |
=14;
(6)57×
| 12 |
| 29 |
| 12 |
| 29 |
=(57+1)×
| 12 |
| 29 |
=58×
| 12 |
| 29 |
=24.
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