（1）x÷0.6=0.6

                 x=0.6×0.6

                 x=0.36（2）3.5x+4.1=7.6

               3.5x=3.5

                    x=1（3）4x-3.8=4.6

               4x=8.4

                 x=2.1

（4）42.5÷x=3.4

                   x=42.5÷3.4

                   x=12.5（5）4（x-6）=12

                   4x=36

                     x=9（6）5x-9=16

            5x=25

              x=5