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解方程.(1)x÷0.26=0.52       

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解方程.
(1)x÷0.26=0.52                           
(2)9x-2x=21.7
(3)3.18×2-2x=4.26                      
(4)0.25x+3.75=12.
解方程:(1)x÷0.26=0.52                           
       x÷0.26×0.26=0.52×0.26,
                   x=0.1352;
(2)9x-2x=21.7,
        7x=21.7,
     7x÷7=21.7÷7,
         x=3.1;
(3)3.18×2-2x=4.26,
        6.36-2x=4.26,
             2x=6.36-4.26,
          2x÷2=2.1÷2,
              x=1.05;  
(4)0.25x+3.75=12.
0.25x+3.75-3.75=12-3.75,
    0.25x÷0.25=8.25÷0.25,
              x=33.