解方程 3×0.7+4x=

解方程 3×0.7+4x=6.5 3.6x-x=3.25 2(x-0.5)=1.6 2+1.8-5x=3.6 6x+4x-11=2.9 7(x-1.2)=2.1.

(1)3×0.7+4x=6.5,
            2.1+4x=6.5,
       2.1+4x-2.1=6.5-2.1,
               4x=4.4,
            4x÷4=4.4÷4,
                x=1.1;

(2)3.6x-x=3.25,
       2.6x=3.25,
  2.6x÷2.6=3.25÷2.6,
          x=1.25;

(3)2(x-0.5)=1.6,
           2x-1=1.6
         2x-1+1=1.6+1,
             2x=2.6,
          2x÷2=2.6÷2,
              x=1.3;

(4)2+1.8-5x=3.6,
       3.8-5x=3.6,
   3.8-3.6-5x=3.6-3.6,
       0.2-5x=0,
    0.2-5x+5x=0+5x,
          0.2=5x,
       0.2÷5=5x÷5,
            x=0.04;

(5)6x+4x-11=2.9,
       10x-11=2.9,
    10x-11+11=2.9+11,
          10x=13.9,
      10x÷10=13.9÷10,
            x=1.39;

(6)7(x-1.2)=2.1,
      7x-7×1.2=2.1,
         7x-8.4=2.1,
     7x-8.4+8.4=2.1+8.4,
             7x=10.5,
          7x÷7=10.5÷7,
              x=1.5.
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