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Các câu hỏi tương tự
1x4+2x5+3x6+4x7+....+98x101
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
Tính tổng:
A = 1x2+3x4+4x5+...+99x100
B = 1x22+2x32+3x42+4x52+...+99x1002
M=1x2+2x3+3x4+4x5+....+99x100
tính tổng:S= 1x2 + 2x3 + 3x4 + 4x5 +...+ 99x100
tinh:
a,1/2x3 +1/3x4 + 1/4x5 +.....+1/99x100
tính 1/2x3+1/3x4+1/4x5+...1/99x100
Tính S= 1x2+2x3+3x4+4x5+...+99x100