Các câu hỏi tương tự
tính tổng A=1x2x3+3x4x5+....+99x100x101
tính tổng sau :
A=1x2x3+2x3x4+3x4x5+..............+99x100x101.
bài 1
tính A = 1x2x3+3x4x5+5x6x7+.......+99x100x102
Làm nhanh giùm mình nha!
a/ 1x3 + 3x5 + .... + 99x101
b/ 1x2x3 + 2x3x4 + 3x4x5 + ........... + 99x100x101
Tính 1/1x2x3+ 1/ 2x3x4 + 1/3x4x5 + 1/ 5x6x7 + ...............+ 1/ 35x36x37
Tính nhanh:2/1x2x3+2/2x3x4+2/3x4x5+2/4x5x6+2/5x6x7+2/6x7x8
Giúp mình với!Thanks
C = 3/1x2 + 3/2x3 + ... + 3/9x10 + 77/2x9
D = 2/1x2x3 + 2/3x4x5 + ...+2/99x100x101
E = 4/1x3x5 + 4/3x5x7 + ... + 4/9x11x13
Tính
A = 3x4+4x5+5x6+6x7+.....+79x80
B = 1x2x3+3x4x5+5x6x7+.....+98x99x100
C = 1x4+2x5+3x6+4x7+.....+97x100
A=1x2+2x3+3x4+...+49x50
B=1x3+3x5+5x7+...+99x101
C=1x2x3+2x3x4+3x4x5+...+50x51x52
D=1x4+2x5+3x6+...+60x63
E=1x1+2x2+3x3+...+50x50
F=1x1+3x3+5x5+...+71x71
G=1x1+4x4+7x7+...+100x100
I=1x2x3+3x4x5+5x6x7+...+69x70x71