tinh
S = 2/1x3-4/3x5+6/5x7-8x7x9+...-96/95x97+98/97x99
Tính tổng:
A=1/1+1/2+1/3+1/4+1/5+1/6
B=1x3+3x5+5x7+7x9+...+95x97+97x99
Tính tổng:(giúp em nhá) B=1x3+3x5+5x7+7x9+...+95x97+97x99
Tính tổng:(giúp em nhá)
B=1x3+3x5+5x7+7x9+...+95x97+97x99
tính nhanh
1x3 + 3x5 + 5x7 + 7x9 + ......... + 97x99
tinh E=1x3+3x5+5x7+...+97x99+99x101
tinh E= 1x3+3x5+5x7+....+97x99+99x101
tinh gia tri cua bieu thuc \
A= (100+98+96+....................+2)-97-95-......-1
B=1+2-3-4+5+6-7-8+9+10-11-12+............-299-300+301+302
1x3+3x5+5x7+...+97x99