解方程. x÷1.44=0.4 3.85+1.5x=6.1 6x-0.9=4.5.

问题描述:

解方程.
x÷1.44=0.4        
3.85+1.5x=6.1         
6x-0.9=4.5.

(1)x÷1.44=0.4
  x÷1.44×1.44=0.4×1.44
              x=0.576;
(2)3.85+1.5x=6.1 
3.85+1.5x-3.85=6.1-3.85
          1.5x=2.25
     1.5x÷1.5=2.25÷1.5
             x=1.5;
(3)6x-0.9=4.5
 6x-0.9+0.9=4.5+0.9
         6x=5.4
      6x÷6=5.4÷6
          x=0.9.