题目内容
正确,合理计算
50+2.5÷
-0.75×0.5-75%
×
+
×
+
×
21-[(2.75-
)÷
]
1285-199.
50+2.5÷
| 4 |
| 3 |
| 5 |
| 23 |
| 3 |
| 8 |
| 5 |
| 16 |
| 2 |
| 23 |
| 10 |
| 23 |
| 5 |
| 16 |
21-[(2.75-
| 5 |
| 12 |
| 1 |
| 3 |
1285-199.
(1)50+2.5÷
-0.75×0.5-75%
=50+0.75×(2.5-0.5-1)
=50+0.75×1
=50.75;
(2)
×
+
×
+
×
=
×
+
×
+
×
=
×(
+
+
)
=
×
=
;
(3)21-[(2.75-
)÷
]
=21-[
÷
]
=21-7
=14;
(4)1285-199
=1285-200+1
=1085+1
=1086.
| 4 |
| 3 |
=50+0.75×(2.5-0.5-1)
=50+0.75×1
=50.75;
(2)
| 5 |
| 23 |
| 3 |
| 8 |
| 5 |
| 16 |
| 2 |
| 23 |
| 10 |
| 23 |
| 5 |
| 16 |
=
| 5 |
| 23 |
| 3 |
| 8 |
| 5 |
| 23 |
| 2 |
| 16 |
| 5 |
| 23 |
| 10 |
| 16 |
=
| 5 |
| 23 |
| 3 |
| 8 |
| 2 |
| 16 |
| 10 |
| 16 |
=
| 5 |
| 23 |
| 9 |
| 8 |
=
| 45 |
| 184 |
(3)21-[(2.75-
| 5 |
| 12 |
| 1 |
| 3 |
=21-[
| 7 |
| 3 |
| 1 |
| 3 |
=21-7
=14;
(4)1285-199
=1285-200+1
=1085+1
=1086.
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