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4.56×0.27+483×0.0456+1.9×4.56+0.456×304-(35-12+13)X-0.4X-1.2=13.2712+114+3316+99112.

题目详情
4.56×0.27+483×0.0456+1.9×4.56+0.456×30   4-(
3
5
-
1
2
+
1
3
X-0.4X-1.2=13.2 7
1
2
+1
1
4
+33
1
6
+99
1
12
▼优质解答
答案和解析
(1)4.56×0.27+483×0.0456+1.9×4.56+0.456×30,
=0.0456×(27+483+190+300),
=0.0456×1000,
=45.6;

(2)4-(
3
5
-
1
2
+
1
3
),
=4-(
18
30
-
15
30
+
10
30
),
=4-
13
30

=3
17
30


(3)X-0.4X-1.2=13.2,
 X-0.4X-1.2+1.2=13.2+1.2,
           0.6X=14.4,
      0.6X÷0.6=14.4÷0.6,
              X=24;

(4)7
1
2
+1
1
4
+33
1
6
+99
1
12

=(7+1+33+99)+(
1
2
+
1
4
+
1
6
+
1
12
),
=[(7+33)+(1+99)]+(1-
1
2
+
1
2
-
1
4
+
1
2
-
1
3
+
1
3
-
1
4
),
=140+(1-
1
4
+
1
2
-
1
4
),
=140+1,
=141.