解方程. x-12%x=2.816 4

解方程. x-12%x=2.816 45×14-12x=120.
2025-01-03 07:22:11
推荐回答(1个)
回答1:

(1)x-12%x=2.816,
     (1-12%)x=2.816,
          0.88x=2.816,
    0.88x÷0.88=2.816÷0.88,
              x=3.2;

(2)

4
5
×
1
4
-
1
2
x=
1
20

        
1
5
-
1
2
x=
1
20

     
1
5
-
1
2
x+
1
2
x=
1
20
+
1
2
x,
       
1
20
+
1
2
x=
1
5

   
1
20
+
1
2
x-
1
20
=
1
5
-
1
20

           
1
2
x=
3
20

         
1
2
x×2=
3
20
×2,
              x=
3
10