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解方程:x+3.4x=28.6 x-0.78x=0.33 7x-2x=25.5 3.6x+2.9x=4.55.

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解方程:
x+3.4x=28.6
x-0.78x=0.33
7x-2x=25.5 3.6x+2.9x=4.55.
解方程:x+3.4x=28.6 x-0.78x=0.33 7x-2x=25.5 3.6x+2.9x=4.55.
(1)x+3.4x=28.6,
           4.4x=28.6,
      4.4x÷4.4=28.6÷4.4,
              x=6.5;
(2)x-0.78x=0.33,
       0.22x=0.33,
 0.22x÷0.22=0.33÷0.22,
           x=1.5;
(3)7x-2x=25.5,
        5x=25.5,
     5x÷5=25.5÷5,
         x=5.1;
(4)3.6x+2.9x=4.55,
          6.5x=4.55,
     6.5x÷6.5=4.55÷6.5,
             x=0.7.