ban lam sai de roi!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
1.1+2.2+3.3+4.4+5.5+6.6+7.7+8.8+9.9
Tính :
1.1 + 2.2 + 3.3 + 4.4 + ... + 100.100
a) A = 1.2.3 +2.3.3 +3.4.3 + 4.5.3 +...+98.99.3
b) B = 1.1 + 2.2 + 3.3 + 4.4 +...+98.98
1.1+2.2+3.3...+22=
1.1+2.2+3.3+....+20.9+22=....
Tính 1.1 + 2.2 + 3.3 +.... + 20.9 + 22 = .....
1/2.2 + 1/3.3 + 1/4.4 +...+ 1/99.99 + 1/100.100
1/2.2 + 1/3.3 + 1/4.4 +....+ 1/99.99 + 1/100.100
giúp mk nha
1/2.2+1/3.3+1/4.4+...+1/9.9
Cảm ơn các bạn !