425÷x=0.8

425÷x=0.8x×134=3735x+5×4=95x-23x?5=18.
2025-12-25 10:55:43
推荐回答(1个)
回答1:

(1)

4
25
÷x=0.8,
     
4
25
÷x×x=0.8×x,
      
4
25
÷0.8=0.8×x÷0.8,
              x=0.2;

(2)x×1
3
4
=
3
7

  x×
7
4
×
4
7
=
3
7
×
4
7

          x=
12
49


(3)
3
5
x+5×4
=95,
        
3
5
x
+20=95,
     
3
5
x
+20-20=95-20,
        
3
5
x
×
5
3
=75×
5
3

              x=125;

(4)x-
2
3
x
-5=18,
      
1
3
x
-5=18,
    
1
3
x
-5+5=18+5,
      
1
3
3=23×3,
           x=69.