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计算,能简算的要简算.49.2÷(4.3×2-0.4)45×79+45×1199920-(58-1120)-38(25+13)÷45+34.

题目详情
计算,能简算的要简算.
49.2÷(4.3×2-0.4)
4
5
×
7
9
+
4
5
×
11
9
9
9
20
-(
5
8
-
11
20
)-
3
8
    
2
5
+
1
3
÷
4
5
+
3
4
▼优质解答
答案和解析
(1)49.2÷(4.3×2-0.4),
=49.2÷(8.6-0.4),
=49.2÷8.2,
=6;

(2)
4
5
×
7
9
+
4
5
×
11
9

=
4
5
×(
7
9
+
11
9
),
=
4
5
×2,
=
8
5


(3)9
9
20
-(
5
8
-
11
20
)-
3
8

=9
9
20
-
5
8
+
11
20
-
3
8

=(9
9
20
+
11
20
)-(
5
8
+
3
8
),
=10-1,
=9;

(4)(
2
5
+
1
3
)÷
4
5
+
3
4

=
11
15
×
5
4
+
3
4

=
11
12
+
3
4

=
5
3