Question

解方程．x-3.7+2.6=

解方程．x-3.7+2.6=9.8 4.8÷120%x=40 135-12x=0.5

Answer 1

（1）x-3.7+2.6=9.8
     x-3.7+2.6-2.6=9.8-2.6
             x-3.7=7.2
         x-3.7+3.7=7.2+3.7
                 x=10.9；

（2）4.8÷120%x=40
4.8÷120%x×120%x=40×120%x
        40×120%x=4.8
              48x=4.8
          48x÷48=4.8÷48
                x=0.1；

（3）1

3

5

-

1

2

x=0.5
 1

3

5

-

1

2

x+

1

2

x=0.5+

1

2

x
   

1

2

x+0.5=1

3

5

1

2

x+0.5-0.5=1

3

5

-0.5
       

1

2

x=1.1
    

1

2

x÷

1

2

=1.1÷

1

2

          x=2.2．