Question

tìm x

x-20%*x=216

 

Answer 1

x - 20% * x = 216

    x*( 1-20%)=216

   x* ( 1-\(\frac{1}{5}\))=216

    x*( \(\frac{5}{5}\)-\(\frac{1}{5}\))=216

                x*\(\frac{4}{5}\)=216

                          x=216 : \(\frac{4}{5}\)

                         x = 216* \(\frac{5}{4}\)

                        x = 270

Answer 2

x-20%*x=216

x*(1-20%)=216

x*4/5=216

x=216:4/5

x=270

Vậy x=270

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