Question

7) Tìm x 

x+x*2.7+x*6.3 = 120

Answer 1

x+x*2.7+x*6.3 = 120

x+x*(2.7+6.3) = 120

x+x*10 = 120

         x = 120: 10

         x=12

Answer 2

x(1+2,7+6,3)=120

x*10=120

x=12 nha bạn .