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Ta có:
\(2^6=\left(2^3\right)^2=8^2\)\(=64\)
\(6^2=36\)
Vì \(8^2>6^2\)
⇒\(2^6>6^2\)
\(a,2^6=64\)
\(6^2=36\)
Vì \(64>36\) ⇒ \(2^6>6^2\)
\(b,3^4=81\)
\(4^3=64\)
Vì \(81>64\) ⇒ \(3^4>4^3\)
\(c,5^4=625\)
\(4^5=1024\)
Vì \(625< 1024\) ⇒ \(5^4< 4^5\)
a, Ta có : \(\frac{1}{1.2}+\frac{1}{3.4}+\frac{1}{5.6}+...+\frac{1}{199.200}=1-\frac{1}{2}+\frac{1}{3}-\frac{1}{4}+\frac{1}{5}-\frac{1}{6}+...+\frac{1}{199}-\frac{1}{200}\)
\(=\left(1+\frac{1}{3}+\frac{1}{5}+...+\frac{1}{199}\right)-\left(\frac{1}{2}+\frac{1}{4}+\frac{1}{6}+...+\frac{1}{200}\right)\)
\(=\left(1+\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+\frac{1}{5}+\frac{1}{6}+...+\frac{1}{199}+\frac{1}{200}\right)-2\left(\frac{1}{2}+\frac{1}{4}+\frac{1}{6}+...+\frac{1}{200}\right)\)
\(=\left(1+\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{199}+\frac{1}{200}\right)-\left(1+\frac{1}{2}+\frac{1}{3}+...+\frac{1}{100}\right)\)
\(=\frac{1}{101}+\frac{1}{102}+...+\frac{1}{200}\)
=> \(\frac{\frac{1}{1.2}+\frac{1}{3.4}+\frac{1}{5.6}+...+\frac{1}{199.200}}{\frac{1}{101}+\frac{1}{102}+...+\frac{1}{200}}=1\)
=> đpcm
Study well ! >_<
Bài 1:
a) 02002 < 02023
b) 20220 = 20230
c) 549 < 5510
d) ( 4 + 5 )3 > 42 + 52
đ) 92 - 32 > ( 9 - 3 )2
Bài 2:
a) 32 x 43 - 32 + 333
= 9 x 64 - 9 + 333
= 576 - 9 + 333
= 567 + 333
= 900
b) 5 x 43 + 24 x 5 + 410
= 5 x 64 + 24 x 5 + 1
= 5 x ( 64 + 24 ) + 1
= 5 x 88 + 1
= 440 + 1
= 441
c) 23 x 42 + 32 x 5 - 40 x 12023
= 8 x 16 + 9 x 5 - 40 x 1
= 128 + 45 - 40
= 133
Bài 1 :
a) \(0^{2002}=0;0^{2023}=0\Rightarrow0^{2002}=0^{2023}\)
b) \(2022^0=1;2023^0=1\Rightarrow2022^0=2023^0\)
c) \(54^9< 55^9;55^9< 55^{10}\Rightarrow54^9< 55^{10}\)
d) \(\left(4+5\right)^3>\left(4+5\right)^2;\left(4+5\right)^2>4^2+5^2\Rightarrow\left(4+5\right)^3>4^2+5^2\)
đ) \(9^2-3^2=81-9=82;\left(9-3\right)^2=6^2=36\Rightarrow9^2-3^2>\left(9-3\right)^2\)
a ) Ta có :
530 = ( 53 )10 = 12510
MÀ 12510 > 310 hay 530 > 310
Vậy 530 > 310
b ) TA CÓ :
24 = 16
5303 = 52 . 5301 = 25 . 5301
Mà 25 . 5301 > 16 Do đó 5303 > 24
Vậy 5303 > 24
c ) ( tương tự phần b )
A = \(\dfrac{11}{2^3.3^4.5^2}\) = \(\dfrac{11.5}{2^3.3^4.5^3}\) = \(\dfrac{55}{2^3.3^4.5^3}\)
B = \(\dfrac{29}{2^2.3^4.5^3}\) = \(\dfrac{29.2}{2^3.3^4.5^3}\) = \(\dfrac{58}{2^3.3^4.5^3}\)
A < B
`#3107.101107`
a)
`64^150` và `4^450`
Ta có:
`64^150 = (4^3)^150 = 4^(3*150) = 4^450`
Vì `450 = 450 => 4^450 = 4^450 => 64^150 = 4^450`
Vậy, `64^150 = 4^450`
b)
`81^64` và `27^100`
Ta có:
`81^64 = (3^4)^64 = 3^(4*64) = 3^256`
`27^100 = (3^3)^100 = 3^(3*100) = 3^300`
Vì `256 < 300 => 3^256 < 3^300 => 81^64 < 27^100`
Vậy, `81^64 < 27^100`
c)
`125^1000` và `25^3000`
Ta có:
`125^1000 = (5^3)^1000 = 5^(3*1000) = 5^3000`
Vì `5 < 25 => 5^3000 < 25^3000 => 125^1000 < 25^3000`
Vậy, `125^1000 < 25^3000`
d)
`4^30` và `3^40`
Ta có:
`4^30 = 4^(3*10) = (4^3)^10 = 64^10`
`3^40 = 3^(4*10) = (3^4)^10 = 81^10`
Vì `64 < 81 => 64^10 < 81^10 => 4^30 < 3^40`
Vậy, `4^30 < 3^40`
m)
`2^5000` và `5^2000`
Ta có:
`2^5000 = 2^(5*1000) = (2^5)^1000 = 32^1000`
`5^2000 = 5^(2*1000) = (5^2)^1000 = 25^1000`
Vì `32 > 25 => 32^1000 > 25^1000 => 2^5000 > 5^2000`
Vậy, `2^5000 > 5^2000`
h)
`6^450` và `3^750`
Ta có:
`6^450 = 6^(150*3) = (6^3)^150 = 216^150`
`3^750 = 3^(150*5) = (3^5)^150 = 243^150`
Vì `216 < 243 => 216^150 < 243^150 => 6^450 < 3^750`
Vậy, `6^450 < 3^750`
0)
`333^444` và `444^333`
Ta có:
`333^444 = 333^(4*111) = (333^4)^111 = (3^4 *111^4)^111 = 81^111 * 111^444`
`444^333 = 444^(3*111) = (444^3)^111 = (4^3 * 111^3)^111 = 64^111 * 111^333`
Vì `81 > 64;` `111^444 > 111^333`
`=> 81^111 * 111^444 > 64^111 * 111^333`
Vậy, `333^444 > 444^333.`
a) Ta có:
\(64^{150}=\left(2^6\right)^{150}=2^{900}\)
\(4^{450}=\left(2^2\right)^{450}=2^{900}\)
Mà: \(2^{900}=2^{900}\Rightarrow64^{150}=4^{450}\)
b) Ta có:
\(81^{64}=\left(3^4\right)^{64}=3^{256}\)
\(27^{100}=\left(3^3\right)^{100}=3^{300}\)
Mà: \(3^{300}>3^{256}\Rightarrow27^{100}>81^{64}\)
c) Ta có:
\(125^{1000}=\left(5^3\right)^{1000}=5^{3000}\)
Mà: \(25^{3000}>5^{3000}\Rightarrow25^{3000}>125^{1000}\)
d) Ta có:
\(4^{30}=\left(4^3\right)^{10}=64^{10}\)
\(3^{40}=\left(3^4\right)^{10}=81^{10}\)
Mà: \(81^{10}>64^{10}\Rightarrow3^{40}>4^{30}\)
m) Ta có:
\(2^{5000}=\left(2^5\right)^{1000}=32^{1000}\)
\(5^{2000}=\left(5^2\right)^{1000}=25^{1000}\)
Mà: \(25^{1000}< 32^{1000}\Rightarrow2^{5000}>5^{2000}\)
h) Ta có:
\(6^{450}=\left(6^3\right)^{150}=216^{150}\)
\(3^{750}=\left(3^5\right)^{150}=243^{150}\)
Mà: \(243^{150}>216^{150}\Rightarrow3^{750}>6^{450}\)
....
a)4^50=(2^2)^50=2^100
Vậy 2^100=4^50
b) 4^3x5^3=(4x5)^3=20^3
Vì 20^3>19^3 nên 4^3x5^3>19^3
Tìm x:
3^2x4^2:(x-2)=12
(3x4)^2:(x-2)=12
12^2:(x-2)-12
x-2=12^2:12
x-2=12
x=12+2
x=14
2.34=2.81=162(1)
53=125(2)
Từ (1) và (2) => 2.34 > 53