Question

解方程4x十5x=6.3

解方程．
4x-5.2=6.3；              5x÷0.08=25；               0.25×4-2x=0.2．

Answer 1

①4x-5.2=6.3
  4x-5.2+5.2=6.3+5.2
          4x=11.5
       4x÷4=11.5÷4
         嫌巧谈  x=2.875

    ②5x÷0.08=25
5x÷0.08×0.08=25×0.08
            5x=2
          5x÷5=2÷5
              x=0.4

③0.25×4-2x=0.2
      宽李  1-2x=0.2
     1-2x+2x=0.2+2x
  0.2+2x-0.2=1-0.2
        2x÷2=0.8÷2
     芹碰       x=0.4