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解方程.2.4+3.4x=103.45(x-1.2)=351.4x+0.4x=2362.5x+51=17×8

题目详情
解方程.
2.4+3.4x=103.4                    

5(x-1.2)=35
1.4x+0.4x=236                            2.5x+51=17×8
▼优质解答
答案和解析
(1)2.4+3.4x=103.4
    2.4+3.4x-2.4=103.4-2.4
            3.4x=101
       3.4x÷3.4=101÷3.4
               x=
505
17


(2)5(x-1.2)=35
  5(x-1.2)÷5=35÷5
          x-1.2=7
      x-1.2+1.2=7+1.2
              x=8.2;

(3)1.4x+0.4x=236                           
          1.8x=236
     1.8x÷1.8=236÷1.8
             x=
1180
9


(4)2.5x+51=17×8
     2.5x+51=136
  2.5x+51-51=136-51
        2.5x=85
   2.5x÷2.5=85÷2.5
           x=34.