Question

[le thuy phuong]

bai 1 : tinh bang hai cach

a) 3/22 x3/11 x22 =??

b)( 1/2 + 1/3 ) x2/5 =???

c)

3/5 x 17/21 + 17/21 x 2/5 =???

Answer 1

[le thuy phuong]

ko ai bit thi thui ko tra loi thi cam