解方程:(1)2.65x+0.45x=31 (2)x÷58×45=1 &...

解方程:(1)2.65x+0.45x=31 (2)x÷58×45=1 (3)49:16=x:15.
2024-11-29 02:32:56
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回答1:

(1)2.65x+0.45x=31 
                3.1x=31 
           3.1x÷3.1=31÷3.1
                   x=10;

(2)x÷

5
8
×
4
5
=1 
         
32
25
x=1
      
32
25
32
25
=1÷
32
25

           x=
25
32


(3)
4
9
1
6
=x:15
      
1
6
x=
4
9
×15
    
1
6
x÷
1
6
=
20
3
÷
1
6

        x=40.