解方程：8x-2x=425x-7×12=41x÷6=1.52x+5=402.2x+7.8x=15.369x-5x=36

Question

解方程： 8x-2x=42	5x-7×12=41	x÷6=1.5
2x+5=40	2.2x+7.8x=15.36	9x-5x=36

Answer 1

①8x-2x=42 
         6x=42
      6x÷6=42÷6
          x=7

②5x-7×12=41 
     5x-84=41 
  5x-84+84=41+84
     5x÷5=125÷5
         x=25 

③x÷6=1.5 
x÷6×6=1.5×6
      x=9 

④2x+5=40  
2x+5-5=40-5
 2x÷2=35÷2
     x=17.5 
 
⑤2.2x+7.8x=15.36   
        10x=15.36   
    10x÷10=15.36÷10
          x=1.536 

⑥9x-5x=36
     4x=36
  4x÷4=36÷4
      x=9