Question

解方程1.8x=2.16 2（x+1.7）=9.2  ...

解方程1.8x=2.16 2（x+1.7）=9.2 8x-4x=0.642x-0.24=0.12 7x+2.5x=3.8．

Answer 1

①1.8x=2.16 
 1.8x÷1.8=2.16÷1.8
         x=1.2   

 ②2（x+1.7）=9.2
2（x+1.7）÷2=9.2÷2
   x+1.7-1.7=9.2-1.7
           x=7.5

③8x-4x=0.64
     4x=0.64
  4x÷4=0.64÷4
      x=0.16

    ④2x-0.24=0.12  
 2x-0.24+0.24=0.12+0.24 
           2x=0.36
        2x÷2=0.36÷2
            x=0.18  
               
⑤7x+2.5x=3.8
     9.5x=3.8
9.5x÷9.5=3.8÷9.5
        x=0.4