数学
解方程(1)x÷15+0.4=x÷12-0.1          (2)150.5-4x+0.5x=7.

2019-05-28

解方程
(1)x÷15+0.4=x÷12-0.1         

(2)150.5-4x+0.5x=7.
优质解答
(1)x÷15+0.4=x÷12-0.1,
         
1
15
x+0.4=
1
12
x-0.1,
    
1
15
x+0.4-
1
15
x=
1
12
x-0.1-
1
15
x,
           0.4+0.1=
1
60
x-0.1+0.1,
           0.5×60=
1
60
x×60,
                 x=30;
(2)150.5-4x+0.5x=7,
        150.5-3.5x=7,
   150.5-3.5x+3.5x=7+3.5x,
           150.5-7=7+3.5x-7,
        143.5÷3.5=3.5x÷3.5,
                 x=41.
(1)x÷15+0.4=x÷12-0.1,
         
1
15
x+0.4=
1
12
x-0.1,
    
1
15
x+0.4-
1
15
x=
1
12
x-0.1-
1
15
x,
           0.4+0.1=
1
60
x-0.1+0.1,
           0.5×60=
1
60
x×60,
                 x=30;
(2)150.5-4x+0.5x=7,
        150.5-3.5x=7,
   150.5-3.5x+3.5x=7+3.5x,
           150.5-7=7+3.5x-7,
        143.5÷3.5=3.5x÷3.5,
                 x=41.
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