解方程（带★的要检验）5（x+2.5）=153x-2.3×2=2.612.5÷x=2.5★x-0.48x=2.08．

Question

解方程（带★的要检验）
5（x+2.5）=15
3x-2.3×2=2.6
12.5÷x=2.5
★x-0.48x=2.08．

Answer 1

①5（x+2.5）=15
      5（x+2.5）÷5=15÷5
                  x+2.5=3
             x+2.5-2.5=3-2.5
                         x=0.5

②3x-2.3×2=2.6
        3x-4.6=2.6
  3x-4.6+4.6=2.6+4.6
               3x=7.2
            3x÷3=7.2÷3
                  x=2.4

③12.5÷x=2.5
12.5÷x×x=2.5×x
 2.5x÷2.5=12.5÷2.5
             x=5

  ④x-0.48x=2.08
        0.52x=2.08
0.52x÷0.52=2.08÷0.52
               x=4
检验：把x=4代入
左边=4-0.48×4
=4-1.92
=2.08
左边=右边
所以x=4是方程x-0.48x=2.08的解．