Ta có:

\(2^{200}.2^{100}=\left(2^2\right)^{100}.2^{100}=4^{100}.2^{100}=\left(4.2\right)^{100}=8^{100}\)

\(3^{100}.3^{100}=\left(3.3\right)^{100}=9^{100}\)

Vì \(8< 9\) nên \(8^{100}< 9^{100}\)

Vậy \(2^{200}.2^{100}< 3^{100}.3^{100}\)

\(#WendyDang\)

\(2^{200}\cdot2^{100}=2^{300}=(2^3)^{100}=8^{100}\\3^{100}\cdot3^{100}=(3\cdot3)^{100}=9^{100}\)

Vì \(8< 9\) nên \(8^{100}< 9^{100}\)

hay \(2^{200}\cdot2^{100}< 3^{100}\cdot3^{100}\)

C gbcgghfdhsgxwvdgdrgdtdgst

a: \(A=2019\cdot2021=2020^2-1\)

\(B=2020^2\)

Do đó: A<B

Dịch ra là: Ta có: 3A = 3. (1 + 3 + 32 + 33 + ... + 399 + 3100) (1 + 3 + 32 + 33 + ... + 399 + 3100) 3A = 3 + 32 + 33 + ... + 3100 + 31013 + 32 + 33 + ... + 3100 + 3101 Suy ra: 3A - A = (3 + 32 + 33 + ... + 3100 + 3101) - (1 + 3 + 32 + 33 + ... + 399 + 3100) (3 + 32 + 33 + ... + 3100 + 3101) - (1 + 3 + 32 + 33 + ... + 399 + 3100) ⇒⇒ A = 3101−123101−12 Vậy A = 3101−12

Mà đoạn 2A sai nhé bạn, sửa lại:

2A = 3101−13101−1 2A=-10001

A=-10001/2

A=-5000,5

Vậy A=-5000,5

Bài 1:

a. $2^{29}< 5^{29}< 5^{39}$

$\Rightarrow A< B$

b.

$B=(3^1+3^2)+(3^3+3^4)+(3^5+3^6)+...+(3^{2009}+3^{2010})$

$=3(1+3)+3^3(1+3)+3^5(1+3)+...+3^{2009}(1+3)$

$=(1+3)(3+3^3+3^5+...+3^{2009})$

$=4(3+3^3+3^5+...+3^{2009})\vdots 4$

Mặt khác:

$B=(3+3^2+3^3)+(3^4+3^5+3^6)+....+(3^{2008}+3^{2009}+3^{2010})$

$=3(1+3+3^2)+3^4(1+3+3^2)+...+3^{2008}(1+3+3^2)$

$=(1+3+3^2)(3+3^4+....+3^{2008})=13(3+3^4+...+3^{2008})\vdots 13$

Bài 1:
c.

$A=1-3+3^2-3^3+3^4-...+3^{98}-3^{99}+3^{100}$

$3A=3-3^2+3^3-3^4+3^5-...+3^{99}-3^{100}+3^{101}$

$\Rightarrow A+3A=3^{101}+1$
$\Rightarrow 4A=3^{101}+1$

$\Rightarrow A=\frac{3^{101}+1}{4}$

Bài 2:

a. $7\vdots n+1$

$\Rightarrow n+1\in \left\{1; -1; 7; -7\right\}$

$\Rightarrow n\in \left\{0; -2; 6; -8\right\}$

b.

$2n+5\vdots n+1$
$\Rightarrow 2(n+1)+3\vdots n+1$

$\Rightarrow 3\vdots n+1$

$\Rightarrow n+1\in \left\{1; -1; 3; -3\right\}$

$\Rightarrow n\in \left\{0; -2; 2; -4\right\}$

2.So sánh 2³¹⁰⁰ va 3²¹⁰⁰ 

^{\(2^{3100}=\left(2^{31}\right)^{100}\)}

\(3^{2100}=\left(3^{21}\right)^{100}\)

Vậy \(63^{100}=63^{100}\)

k nha

2³¹⁰⁰ < 3²¹⁰⁰

ủng hộ nha! 56767657585643634665756756834534645

tính lộn rùi \(2^{3100}< 3^{2100}\)

k nha

A

7,308 tấn

a

A

xin lỗi bài trên của mình làm sai

Ta có: 3A = 3.(1+3+3²+3³+...+3⁹⁹+3¹⁰⁰⁾ 

3A = 3+3²+3³+...+3¹⁰⁰+3¹⁰¹

Suy ra: 3A – A = (3+3²+3³+...+3¹⁰⁰+3¹⁰¹)−(1+3+3²+3³+...+3⁹⁹+3¹⁰⁰)

2A = 3¹⁰¹−1

⇒ A = 3¹⁰¹−1

             2               

Vậy A = 3¹⁰¹−1

                 2           

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