Question

Tìm x, y biết 3/x =y/35=-36/84

Answer 1

Ta có: -36/84=-3/7

=> 3/x=y/35=-3/7

3/x=-3/7

=> 3.7=-3.x

=> 21=-3.x

=> 21:(-3)=x

=> x=-7

   y/35=-3/7

=> y.7=35.(-3)

=> y.7=-105

=> y   =-105:7

=> y   =-15

Vậy x=-7;y=-15

Answer 2

Cách nhanh hơn là:-36/84=-3/7

3/x=-3/7 suy ra x=-7

y/35=-3/7suy ra y=-15