Tính:
a) N=1x3+5x7+9x11+...+99x101
b) P=1^2+4^2+7^2+....+100^2
1x3+3x5+5x7+...+99x101
B=1x3+5x7+9x11+...+97x99
tính : 1x3 +3x5 +5x7 +....+99x101
tinh E=1x3+3x5+5x7+...+97x99+99x101
tinh E= 1x3+3x5+5x7+....+97x99+99x101
Tính nhanh:
(7/5x7)+(7/7x9)+(7/9x11)+...+(7/99x101)
2\1x3+2\3x5+2\5x7+...+2\99x101
Tính nhanh: A = 1x3+5x7+9x11+...+41x43
