题目内容
怎样算简便就怎样算.
6÷
|
|
| ||||||||||||||
[
| 99×
| 11.58-(7
|
①6÷
-
÷6,
=6×
-
×
,
=20-
,
=19
;
②
×
÷(
-
),
=
÷
,
=
;
③
×3.2+5.6×0.5+1.2×50%,
=0.5×3.2+5.6×0.5+1.2×0.5,
=(3.2+5.6+1.2)×0.5,
=10×0.5,
=5;
④[
-(
+
)]÷
,
=[
-
]÷
,
=
×
,
=
;
⑤99×
,
=(98+1)×
,
=98×
+1×
,
=97+
,
=97
;
⑥11.58-(7
+1.58),
=11.58-7
-1.58,
=11.58-1.58-7
,
=10-7
,
=2
.
| 3 |
| 10 |
| 3 |
| 10 |
=6×
| 10 |
| 3 |
| 3 |
| 10 |
| 1 |
| 6 |
=20-
| 1 |
| 20 |
=19
| 19 |
| 20 |
②
| 1 |
| 3 |
| 3 |
| 4 |
| 3 |
| 4 |
| 5 |
| 12 |
=
| 1 |
| 4 |
| 1 |
| 3 |
=
| 3 |
| 4 |
③
| 1 |
| 2 |
=0.5×3.2+5.6×0.5+1.2×0.5,
=(3.2+5.6+1.2)×0.5,
=10×0.5,
=5;
④[
| 5 |
| 3 |
| 2 |
| 5 |
| 3 |
| 4 |
| 31 |
| 4 |
=[
| 5 |
| 3 |
| 23 |
| 20 |
| 31 |
| 4 |
=
| 31 |
| 60 |
| 4 |
| 31 |
=
| 1 |
| 15 |
⑤99×
| 97 |
| 98 |
=(98+1)×
| 97 |
| 98 |
=98×
| 97 |
| 98 |
| 97 |
| 98 |
=97+
| 97 |
| 98 |
=97
| 97 |
| 98 |
⑥11.58-(7
| 5 |
| 11 |
=11.58-7
| 5 |
| 11 |
=11.58-1.58-7
| 5 |
| 11 |
=10-7
| 5 |
| 11 |
=2
| 6 |
| 11 |
练习册系列答案
相关题目