tính:a)1/2022-5/2.4-5/4.6-5/6.8.....5/2020.2022

b)2^2/1.3+2^2/3.5+...+2^2/197.199

1^2/1.3+2^2/1.3+................+99^2/197.199

\(\frac{5}{1.3}+\frac{5}{3.5}+....+\frac{5}{99.101}\)

tính nhanh

A=2/1.3+2/3.5+2/5.7+...+2/49.51

B=2/5+2/7-1/6-1/8+11/35-34/48+11/12

Bài 3 : (1+1/1.3)(1+1/2.4)(1+1/3.5)...(1+1/99.101)

bài 4: 

(x-3)(x+5)/(x-2)^2 <0

1.3^​x+1=9^x​

2. 2^3x+2=4^​x+5​

​3. 3^2x-1​=243

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a) Tính tổng : \(S=\frac{5}{1.3}+\frac{5}{3.5}+\frac{5}{5.7}+...+\frac{5}{97.99}\)

Tính A=(1+1/1.3)(1+1/2.4)(1+1/3+5)......(1+1/2007.2009)

Tính: 2/1.3+ 2/3.5+ 2/5.7+ ......... + 2/97.99