解方程3x-4×6.5=7.6 &n...

解方程3x-4×6.5=7.6 12.5x+x=108x-9.42=12.56 58.9+x=100.

(1)3x-4×6.5=7.6 
            3x-26=7.6
         3x-26+26=7.6+26
               3x=33.6
            3x÷3=33.6÷3
                x=11.2;
     
(2)12.5x+x=108
      13.5x=108
13.5x÷13.5=108÷13.5
          x=8;

(3)x-9.42=12.56    
x-9.42+9.42=12.56+9.42
          x=21.98;
          
(4)58.9+x=100
58.9+x-58.9=100-58.9
          x=41.1.
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