Question

解方程．6x-12=108 9x+5x=8.4 2.5x

解方程．6x-12=108 9x+5x=8.4 2.5x-25=5 x-0.8x=1 2x+23×4=134 3x+x+6=26．

Answer 1

①6x-12=108
  6x+12-12=108+12
        6x=120
     6x÷6=120÷6
         x=20

②9x+5x=8.4
    14x=8.4
14x÷14=8.4÷14
      x=0.6

③2.5x-25=5
2.5x+25-25=5+25
      2.5x=30
 2.5x÷2.5=30÷2.5
         x=12

④x-0.8x=1
     0.2x=1
0.2x÷0.2=1÷0.2
        x=5

⑤2x+23×4=134
    2x+92=134
 2x+92-92=134-92
       2x=42
    2x÷2=42÷2
        x=21

⑥3x+x+6=26
  4x+6-6=26-6
      4x=20
   4x÷4=20÷4
       x=5