问题 解答题
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
答案

(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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