解方程. ①7x+0.5=2.6 ②5x-2.3×4=5.7 ③2x-0.8x=0.24.

2025-06-20 09:41:25
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回答1:

①7x+0.5=2.6
    7x+0.5-0.5=2.6-0.5
                 7x=2.1
             7x÷7=2.1÷7
                   x=0.3

②5x-2.3×4=5.7
       5x-9.2=5.7
5x-9.2+9.2=5.7+9.2
             5x=14.9
         5x÷5=14.9÷5
              x=2.98

③2x-0.8x=0.24
        1.2x=0.24
 1.2x÷1.2=0.24÷1.2
            x=0.2