题目内容

计算:
(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)+
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
×
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×
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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