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计算:4x-7×1.3=9.9112:0.4=1.35:X3-19×112+560.9-(0.15+0.35÷57)7.25-337+3.75-647(2-34×45)÷(112+415)

题目详情
计算:
4x-7×1.3=9.9         
1
1
2
:0.4=1.35:X             
3-
1
9
×1
1
2
+
5
6
0.9-(0.15+0.35÷
5
7
)    
7.25-3
3
7
+3.75-6
4
7
         
(2-
3
4
×
4
5
)÷(
1
12
+
4
15
▼优质解答
答案和解析
(1)4x-7×1.3=9.9,
            4x-9.1=9.9,
        4x-9.1+9.1=9.9+9.1,
             4x÷4=19÷4,
                 x=4.75;

(2)1
1
2
:0.4=1.35:X,
       1
1
2
X=0.4×1.35,
    
3
2
2
3
=0.54×
2
3

           X=0.36;

(3)3-
1
9
×1
1
2
+
5
6

=3-
1
6
+
5
6

=3
2
3


(4)0.9-(0.15+0.35÷
5
7
),
=0.9-(0.15+0.49),
=0.9-0.64,
=0.26.
  
(5)7.25-3
3
7
+3.75-6
4
7

=(7.25+3.75)-(3
3
7
+ 6
4
7
),
=11-10,
=1;
 
(6)(2-
3
4
×
4
5
)÷(
1
12
+
4
15
),
=(2-
3
5
)÷
7
20

=
7
5
×
20
7

=4.