题目内容
计算:
(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)+
-
×
.
(1)(284+16)×(512-8208÷18)+
13 |
60 |
1 |
3 |
1 |
4 |
(2)6-1.19×3-0.43+
1 |
5 |
1 |
45 |
1 |
90 |
(3)3.2×(1.5+2.5)÷1.6+14×
1 |
60 |
1 |
45 |
1 |
90 |
(4)27.85-(7.85+3.4)+
1 |
90 |
1 |
90 |
1 |
12 |
(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+0.2+
×90,
=6-3.57-0.43+2.2,
=6-(3.57+0.43)+2.2,
=2+2.2,
=4.2;
(3)3.2×(1.5+2.5)÷1.6+14×
-
×
,
=3.2×4÷1.6+
+
,
=12.8÷1.6+
-
,
=8
-
,
=8
;
(4)27.85-(7.85+3.4)+
-
×
,
=(27.85-7.85-3.4)+
×
,
=(20-3.4)+
,
=16
+
,
=16
+
,
=16
;
13 |
60 |
1 |
3 |
1 |
4 |
=300×(512-456)+
13 |
180 |
1 |
4 |
=300×56+
13 |
180 |
1 |
4 |
=16800+
13 |
180 |
45 |
180 |
=16800
29 |
90 |
(2)6-1.19×3-0.43+
1 |
5 |
1 |
45 |
1 |
90 |
=6-3.57-0.43+0.2+
1 |
45 |
=6-3.57-0.43+2.2,
=6-(3.57+0.43)+2.2,
=2+2.2,
=4.2;
(3)3.2×(1.5+2.5)÷1.6+14×
1 |
60 |
1 |
45 |
1 |
90 |
=3.2×4÷1.6+
14 |
60 |
1 |
4050 |
=12.8÷1.6+
7 |
30 |
1 |
4050 |
=8
945 |
4050 |
1 |
4050 |
=8
472 |
2025 |
(4)27.85-(7.85+3.4)+
1 |
90 |
1 |
90 |
1 |
12 |
=(27.85-7.85-3.4)+
1 |
90 |
11 |
12 |
=(20-3.4)+
11 |
1080 |
=16
3 |
5 |
11 |
1080 |
=16
648 |
1080 |
11 |
1080 |
=16
659 |
1080 |
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