2 câu trả lời
`A = 3/2 xx 4/3 xx 5/4 xx ... xx 100/99`
`=> A = (3 xx 4 xx 5 xx ... xx 100)/(2 xx 3 xx 4 xx ... xx 99)`
`=> A = 100/2 = 50`
Vậy `A = 50`
`#dtkc`
$\text{A = }$$\frac{3}{2}$ $\text{. }$$\frac{4}{3}$ $\text{. }$$\frac{5}{4}$ $\text{...}$$\frac{100}{99}$
$\text{A = }$$\frac{100}{2}$
$\text{A = 50}$
$\text{=> Vậy: A = 50}$