Nè bé
B= 1.3+ 3.5 + 5.7 +... +97.99
2:B= 2/1.3 + 2/3.5 + 2/5.7 +.... + 2/97.99
2/B= 1/1-1/3+1/3-1/5+1/5-1/7+....+1/97-1/99
2/B=1/1-1/99
2:B=98/99
B=2: 98/99
B= 2. 99/98
B= 99/49
B=1/1×3+1/3×5+1/5×7+...+1/97×99
b=1+3+5+7+....+95+97+99
G= 1/1*3*5 +1/3*5*7+ 1/5*7*9+...+1/95*97*99
Bài 1 tính nhanh
a 3/3*5+3/5*7+3/7*9+...+3/97*99
b 3/1*4+3/4*7+3/7*10+...+3/100*103
A=1*3+3*5+5*7+...+95*97+97*99
Giup mb
A= 1/3 ; 3/5: 5/7:..:97/99
SOS CẦN GẤP Ạ !!!!
tinh A= 1/3*5+1/5*7+1/7*9+....1/97*99
A=2 3/10-75%-1/4+0,7
B=20%+5 1/2+40%
C=0,202×16×12,5×50
D=6/1×3+6/3×5+6/5×7+....+6/95×97+6/97×99
E=0,33+0,38+0,67+12%
F=1,45×36+1,45×64/60×3,6-40×5,4+145×5