17x-3x=4.2 x是几

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17x-3x=4.2

14x=4.2

x=4.2/14

x=42/140

x=3/10

或x=0.3

望采纳！O(∩_∩)O~

17x-3x=4.2

(17-3)x=4.2

      14x=4.2

         x=4.2/14

         x=0.3

17x-3x=4.2

     14x=4.2

         x=3

17x-3x=4.2   先17x减3x等于14x   14x=4.2   那么4.2除以14就等于0.3    x=0.3

这是一元一次方程，X是0.3呀。

14x=4.2

x=4.2/14

x=0.3

17x-3x=4.2

14x=4.2

x=4.2÷14

x=0.3

17x-3x=4.2

14x=4.2

x=4.2/14

x=0.3