解方程(或解比例)18:X=27:1.2 72×8-13X=12 ...

解方程(或解比例)18:X=27:1.2 72×8-13X=12 13:38=4X:12 34X÷15=12.
2025-05-20 00:54:35
推荐回答(1个)
回答(1):

(1)18:x=

2
7
:1.2,
          
2
7
x=18×1.2,
       
2
7
2
7
=21.6÷
2
7

             x=75.6;

(2)
7
2
×8-
1
3
x=12,
    28-
1
3
x+
1
3
x=12+
1
3
x

            28=12+
1
3
x

         28-12=12+
1
3
x-12,
          
1
3
x=16,
        
1
3
x×3=16×3,
             x=48;

(3)
1
3
3
8
=4x:
1
2

       
3
2
x=
1
6

    
3
2
3
2
=
1
6
÷
3
2

         x=
1
6
×
2
3

         x=
1
9



(4)
3
4