Question

co 20 nguoi thi dau co vua, bat tay lam quen Hoi bao nhieu cai bat tay

 ai giai duoc xin ket ban voi em

Answer 1

19+18+17+16+15+14+13+12+11+10+9+8+7+6+5+4+3+2+1=190

Answer 2

20 .nhân 19 chia 2 bằng 190 cái bắt tay bạn nhé

Answer 3

19+18+17+16+15+14+13+12+11+10+9+8+7+6+5+4+3+2+1=190 cai bat nhe .vi nguoi dau tien bat duoc het con nguoi cuoi cung bat 0 nguoi

Answer 4

20x19:2=190