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解方程:2x+0.82﹦8.2解方程:2x+0.82﹦8.23+0.5x﹦77.8÷x﹦2.680x÷4﹦125-0.9x﹦2.752x+0.4x=486-2x+6x=1835x+13x=9.61.3x+2.4×3=12.4.

题目详情
解方程:2x+0.82﹦8.2
解方程:
2x+0.82﹦8.23+0.5x﹦77.8÷x﹦2.6
80x÷4﹦125-0.9x﹦2.752x+0.4x=48
6-2x+6x=1835x+13x=9.61.3x+2.4×3=12.4.

▼优质解答
答案和解析
(1)2x+0.82﹦8.2
    2x+0.82+0.82﹦8.2+0.82
               2x=9.02
            2x÷2=9.02÷2
                x=4.51;

(2)3+0.5x﹦7
   3+0.5x-3﹦7-3
        0.5x=4
   0.5x÷0.5=4÷0.5
           x=8;

(3)7.8÷x﹦2.6
  7.8÷x×x﹦2.6×x
        7.8=2.6x
   7.8÷2.6=2.6x÷2.6
          x=3;

(4)80x÷4﹦12
  80x÷4×4﹦12×4
        80x﹦48
     80x÷80=48÷80
           x=0.6;

(5)5-0.9x﹦2.75
5-0.9x+0.9x﹦2.75+0.9x
          5=2.75+0.9x
     5-2.75=2.75+0.9x-2.75
       2.25=0.9x
 2.2.5÷0.9=0.9x÷0.9
          x=2.5;

(6)2x+0.4x=48
        2.4x=48
   2.4x÷2.4=48÷2.4
           x=20;

(7)6-2x+6x=18
        6+4x=18
      6+4x-6=18-6
          4x=12
       4x÷4=12÷4
           x=3;

(8)35x+13x=9.6
         48x=9.6
     48x÷48=9.6÷48
           x=0.2;

(9)1.3x+2.4×3=12.4
       1.3x+7.2=12.4
       1.3x+7.2=12.4-7.2
           1.3x=5.2
      1.3x÷1.3=5.2÷1.3
              x=4.