Question

用不同的方法求方程（4x-2.4）×2.5=14 的解。

Answer 1

解：
方法一：（4x -2.4）×2.5=14
                             4x-2.4 =14 ÷2.5
                                   4x =5.6 +2.4
                                     x=2
方法二：（4x -2.4）×2.5 =14
            2.5 ×4x-2.4 ×2.5 =14
                               l0x - 6= 14    
                                       x=2
方法三：（4x -2.4）×2.5 =14
           4×（x-0.6）×2.5 =14    
                  l0 ×（x-0.6）=14    
                                x-0.6=1.4    
                                      x=2