题目内容
(1)(284+16)×(512-8208÷18)+
×
+
(2)6-1.19×3-0.43+
+
÷
(3)3.2×(1.5+2.5)÷1.6+14×
-
×
(4)27.85-(7.85+3.4)+
-
×
.
| 5 |
| 7 |
| 3 |
| 25 |
| 3 |
| 7 |
(2)6-1.19×3-0.43+
| 1 |
| 4 |
| 3 |
| 4 |
| 2 |
| 3 |
(3)3.2×(1.5+2.5)÷1.6+14×
| 8 |
| 7 |
| 5 |
| 6 |
| 12 |
| 15 |
(4)27.85-(7.85+3.4)+
| 17 |
| 32 |
| 3 |
| 4 |
| 9 |
| 24 |
分析:根据整数、分数、小数四则混合运算的顺序进行解答即可.
解答:解:(1)(284+16)×(512-8208÷18)+
×
+
,
=300×(512-456)+
+
,
=300×56+
+
,
=16800+
+
,
=16800
;
(2)6-1.19×3-0.43+
+
÷
,
=6-3.57-0.43+
+
,
=6-(3.57-0.43)+
+
,
=6-4+
+
,
=2+
+
,
=3
;
(3)3.2×(1.5+2.5)÷1.6+14×
-
×
,
=3.2×4÷1.6+14×
-
×
,
=8+16-
,
=24-
,
=23
;
(4)27.85-(7.85+3.4)+
-
×
,
=27.85-7.85-3.4+
-
,
=20-3.4+
,
=16.6+
,
=16.85.
| 5 |
| 7 |
| 3 |
| 25 |
| 3 |
| 7 |
=300×(512-456)+
| 3 |
| 35 |
| 3 |
| 7 |
=300×56+
| 3 |
| 35 |
| 3 |
| 7 |
=16800+
| 3 |
| 35 |
| 3 |
| 7 |
=16800
| 18 |
| 35 |
(2)6-1.19×3-0.43+
| 1 |
| 4 |
| 3 |
| 4 |
| 2 |
| 3 |
=6-3.57-0.43+
| 1 |
| 4 |
| 9 |
| 8 |
=6-(3.57-0.43)+
| 1 |
| 4 |
| 9 |
| 8 |
=6-4+
| 1 |
| 4 |
| 9 |
| 8 |
=2+
| 1 |
| 4 |
| 9 |
| 8 |
=3
| 3 |
| 8 |
(3)3.2×(1.5+2.5)÷1.6+14×
| 8 |
| 7 |
| 5 |
| 6 |
| 12 |
| 15 |
=3.2×4÷1.6+14×
| 8 |
| 7 |
| 5 |
| 6 |
| 12 |
| 15 |
=8+16-
| 2 |
| 3 |
=24-
| 2 |
| 3 |
=23
| 1 |
| 3 |
(4)27.85-(7.85+3.4)+
| 17 |
| 32 |
| 3 |
| 4 |
| 9 |
| 24 |
=27.85-7.85-3.4+
| 17 |
| 32 |
| 9 |
| 32 |
=20-3.4+
| 1 |
| 4 |
=16.6+
| 1 |
| 4 |
=16.85.
点评:本题考查了简单的四则混合运算,关键是理清楚运算的顺序,然后根据运算顺序逐步求解即可.
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