> 数学 >
求未知数.
3
20
:6=
6.5
x

3
4
x-1.4=3.6+
2
3
x.
人气:431 ℃ 时间:2019-10-19 16:59:36
解答
(1)
3
20
:6=
6.5
x

          
3
20
x=6×6.5,
          
3
20
x=39,
      
3
20
20
3
=39×
20
3

             x=260;
(2)
3
4
x-1.4=3.6+
2
3
x,
 
3
4
x-1.4
2
3
x=3.6+
2
3
x
2
3
x,
   
1
12
x-1.4=3.6,
1
12
x-1.4+1.4=3.6+1.4,
        
1
12
x=5,
   
1
12
x×12=5×12,
           x=60.
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