解方程．x÷5.5=21.22x-0.5×3=0.426x-2.7=1.238.94+5x=33.546.2x+x=41.6x-0.54x=2.3（x-7）÷3=4.88（x-4.2）=42.7x-x=0

Question

解方程． x÷5.5=21.2	2x-0.5×3=0.42	6x-2.7=1.23
8.94+5x=33.54	6.2x+x=41.6	x-0.54x=2.3
（x-7）÷3=4.8	8（x-4.2）=4	2.7x-x=0.85

Answer 1

①x÷5.5=21.2
 x÷5.5×5.5=21.2×5.5
           x=116.6
②2x-0.5×3=0.42                 
 2x-1.5+1.5=0.42+1.5
         2x=1.92
      2x÷2=1.92÷2
          x=0.96 
    ③6x-2.7=1.23   
   6x-2.7+2.7=1.23+2.7      
        6x÷6=3.93÷6
            x=0.655
   ④8.94+5x=33.54         
8.94+5x-8.94=33.54-8.94         
       5x÷5=24.6÷5
           x=4.92
⑤6.2x+x=41.6
     7.2x=41.6
7.2x÷7.2=41.6÷7.2
        x=5(7)/(9)
  ⑥x-0.54x=2.3
      0.46x=2.3
0.46x÷0.46=2.3÷0.46
          x=5
 ⑦（x-7）÷3=4.8 
（x-7）÷3×3=4.8×3
          x-7=14.4
        x-7+7=14.4+7
            x=21.4
⑧8（x-4.2）=4 
8（x-4.2）÷8=4÷8
   x-4.2+4.2=0.5+4.2
           x=4.7 
 ⑨2.7x-x=0.85
     1.7x=0.85
1.7x÷1.7=0.85÷1.7
        x=0.5