题目内容
| 计算下面各题,能用简便方法的就用简便方法 99×
|
24×(
|
| ||||||||||||||||||||||
|
1-(
|
|
(1)99×
,
=(98+1)×
,
=98×
+1×
,
=97+
,
=97
;
(2)24×(
+
-
),
=24×
+24×
-24×
,
=21+36-18,
=39;
(3)
×
÷(
-
),
=
÷
,
=
×
,
=
;
(4)
÷
-(
-
),
=
×
-
+
,
=
+
-
,
=
;
(5)1-(
+
)÷
,
=1-
×4,
=1-
,
=-
;
(6)
×
+
÷
,
=
×
+
×
,
=
×(
+
),
=
×1,
=
.
| 97 |
| 98 |
=(98+1)×
| 97 |
| 98 |
=98×
| 97 |
| 98 |
| 97 |
| 98 |
=97+
| 97 |
| 98 |
=97
| 97 |
| 98 |
(2)24×(
| 7 |
| 8 |
| 3 |
| 2 |
| 3 |
| 4 |
=24×
| 7 |
| 8 |
| 3 |
| 2 |
| 3 |
| 4 |
=21+36-18,
=39;
(3)
| 1 |
| 6 |
| 2 |
| 3 |
| 4 |
| 5 |
| 8 |
| 15 |
=
| 1 |
| 9 |
| 4 |
| 15 |
=
| 1 |
| 9 |
| 15 |
| 4 |
=
| 5 |
| 12 |
(4)
| 4 |
| 9 |
| 4 |
| 5 |
| 1 |
| 5 |
| 1 |
| 3 |
=
| 4 |
| 9 |
| 5 |
| 4 |
| 1 |
| 5 |
| 1 |
| 3 |
=
| 5 |
| 9 |
| 1 |
| 3 |
| 1 |
| 5 |
=
| 31 |
| 45 |
(5)1-(
| 1 |
| 4 |
| 3 |
| 8 |
| 1 |
| 4 |
=1-
| 5 |
| 8 |
=1-
| 5 |
| 2 |
=-
| 3 |
| 2 |
(6)
| 35 |
| 8 |
| 5 |
| 7 |
| 2 |
| 7 |
| 8 |
| 35 |
=
| 35 |
| 8 |
| 5 |
| 7 |
| 2 |
| 7 |
| 35 |
| 8 |
=
| 35 |
| 8 |
| 5 |
| 7 |
| 2 |
| 7 |
=
| 35 |
| 8 |
=
| 35 |
| 8 |
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