题目内容

x÷9=63
3(x-5)=7.5
3x+6x+9.6=72.6
8x-3x-1.5=6.5
83-5x=92÷2
3x+78=9x.
(1)x÷9=63,
     x÷9×9=63×9,
           x=567;

(2)3(x-5)=7.5,
  3(x-5)÷3=7.5÷3
          x-5=2.5,
        x-5+5=2.5+5,
            x=7.5;

(3)3x+6x+9.6=72.6,
        9x+9.6=72.6,
    9x+9.6-9.6=72.6-9.6,
         9x÷9=63÷9,
             x=7;

(4)8x-3x-1.5=6.5,
        5x-1.5=6.5,
    5x-1.5+1.5=6.5+1.5,
            5x=8÷5,
             x=1.6;

(5)83-5x=92÷2,
     83-5x=46,
  83-5x+5x=46+5x,
     83-46=46+5x-46,
     37÷5=5x÷5,
         x=7.4;

(6)3x+78=9x,
  3x+78-3x=9x-3x,
     78÷6=6x÷6,
         x=13.
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