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16×8-5x=232.5x÷20=166.2x-x=41.6x÷0.5=48.6×2.

题目详情
16×8-5x=23                     2.5x÷20=16
6.2x-x=41.6                 x÷0.5=48.6×2.
▼优质解答
答案和解析
(1)16×8-5x=23 
       128-5x+5x=23+5x
        23+5x-23=128-23
           5x÷5=105÷5
               x=21;

(2)2.5x÷20=16
 2.5x÷20×20=16×20
    2.5x÷2.5=320÷2.5
            x=128;

(3)6.2x-x=41.6
       5.2x=41.6
  5.2x÷5.2=41.6÷5.2
          x=8;

(4)x÷0.5=48.6×2
     x÷0.5=97.2
x÷0.5×0.5=97.2×0.5
          x=48.6.