10+12+14+16+18+20= 90
T..i..c..k nha bn
10+12+14+16+18+20
= (10+20) +(12+18) +(14+16)
=30 + 30 +30
=90
xong r đó
Cac bn tra loi cau hoi deu la trong danh sach bn be cua mk,cac bn deu bao mk bay gio mk chon ai day
10+12+14+16+18+20=90
ủng hộ mk nha bạn
10+12+14+16+18+20
=(10+20)+(12+18)+(14+16)
=30+30+30
=90
UNG HO MK NHA