Tính tổng:(giúp em nhá) B=1x3+3x5+5x7+7x9+...+95x97+97x99
Tính tổng:(giúp em nhá)
B=1x3+3x5+5x7+7x9+...+95x97+97x99
tinh gia tri bieu thuc
S = 2/1x3-4/3x5+6/5x7-8/7x9+.....-96/95x97+98/97x99
tinh
S = 2/1x3-4/3x5+6/5x7-8x7x9+...-96/95x97+98/97x99
tính nhanh
1x3 + 3x5 + 5x7 + 7x9 + ......... + 97x99
tìm y ( 1/1x3 + 1/3x5 + 1/5x7 + 1/7x9 + 1/9x11 ) x y= 2/3
tìm y biết :
(1/1x3 + 1/3x5 + 1/5x7 + 1/7x9 + 1/9x11 ) x Y =2/3
1/1x3+1/3X5+1/5X7+1/7X9+…+1/99X101
1/1x3 + 1/3x5 + 1/5x7 + 1/7x9 + 1/9x11
