0.6×(3.8-x)=1.5.

问题描述:

0.6×(3.8-x)=1.5.

0.6×(3.8-x)=1.5,
0.6×(3.8-x)÷0.6=1.5÷0.6,
              3.8-x=2.5,
            3.8-x+x=2.5+x,
              2.5+x=3.8,
          2.5+x-2.5=3.8-2.5,
                  x=1.3.