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A=\(\frac{13^{100+1}}{13^{101+1}}\)=\(\frac{13^{101}}{13^{102}}\)=\(\frac{13^{100}.13}{13^{101}.13}\)=\(\frac{13^{100}}{13^{101}}\)
B=\(\frac{13^{99+1}}{13^{100+1}}=\frac{13^{100}}{13^{101}}\)
Vậy A=B
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Ta có tính chất: \(\dfrac{a}{b}>\dfrac{a-m}{b-m}\)
\(A=\dfrac{2022^{99}-1}{2022^{100}-1}>\dfrac{2022^{99}-1-2021}{2022^{100}-1-2021}\)
\(A>\dfrac{2022^{99}-2022}{2022^{100}-2022}\)
\(A>\dfrac{2022\left(2022^{98}-1\right)}{2022\left(2022^{99}-1\right)}\)
\(A>\dfrac{2022^{98}-1}{2022^{99}-1}\)
\(A>B\)
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(100^99+99^100)^100
(100^100+99^100)^99
ta có : (100^99+99^100)^100=100^9900+99^10000
(100^100+99^100)^99=100^9900+99^9900
=)100^9900=100^9900; 99^10000>99^9900(vì 10000>9900)
=)(100^99+99^100)^100>(100^100+99^100)^99
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A=1-2+3-4+...+99-100 SSH=(100-1):1+1=100 Sh
=>A=(1-2)+(3-4)+....+(99-100)
vì chia thành cặp suy ra 100:2 =50 cặp
A=(-1)+(-1)+...(-1)
A=(-1).50
A=-50
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a Ta có
B= 1-2-3+4-5-6-7+8......+ 97 -98-99+100
= ( 1-2-3+4)+ (5-6-7+8)+ .....+ ( 97-98-99+100)
= 0 +0+... +0 (25 cs 0)
=0 x25=0
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