Question

giup vs

Answer 1

chờ xíu

Answer 2

gọi 3 số lần lượt là a, b ,c

theo bài ra , ta có : \(\dfrac{a}{3}\)= \(\dfrac{b}{5}\); \(\dfrac{a}{7}\)=\(\dfrac{c}{4}\)

=> \(\dfrac{a}{21}\)=\(\dfrac{b}{35}\); \(\dfrac{a}{21}\)=\(\dfrac{c}{12}\)

=> \(\dfrac{a}{21}\)=\(\dfrac{b}{35}\)=\(\dfrac{c}{12}\)=k

=> a=21k ; b=35k ; c=12k

=>BCNN(21k ; 35k ;12k)= 1260

=>420k=1260

=>k=3

=>a=63 ; b=105 ; c=36

Answer 3

co the giai thich ro rang hon ko ban