490-(150:3*4-7)=490-(50*4-7)=490-(200-7)=290+7=297

=490-{ [ 150 / 3 * 4] - 7 } = 490 - { [ 50 * 4 ] - 7 } = 490 - 200 + 7 = 297

\(490-\left\{\left[\left(128+22\right):3.2^2\right]-7\right\}\)

\(=490-\left\{\left[150:3.4\right]-7\right\}\)

\(=490-\left\{200-7\right\}\)

\(=490-193\)

\(=297\)

hok tốt!

a, 10 . 27 - 27 : 9 

= 270 - 3

= 263

b, 7² . 33 + 7² . 67

= 7² ( 33 + 67 )

= 7² . 100

= 49 . 100

= 4900

c, 490 - [ ( 128 + 22 ) : 3 . 2² ] - 7 

= 490 - ( 150 : 3 . 4 ) - 7 

= 490 - ( 50 . 4 ) - 7 

= 490 - 200 - 7

= 290 - 7

= 283

a, 125+70+375+230

= (125+375)+(70+230)

= 500+300 = 800

b,  7 2 . 33 + 7 2 . 67

= 49.33+49.67 = 49.(33+67) = 49.100 = 4900

c, 35.11+65.18+35.13+65.6

= 35.(11+13)+65.(18+6) = 35.24+65.24 = 24.(35+65) = 24.100 = 2400

d, 490 – {[(128+22):3. 2 2 ] – 7}

= 490 – {[150:3.4] – 7}

= 490 – {[50.4] – 7}

= 490 – {200 – 7}

= 490 – 193 = 297

\(D=\) \(\frac{11.3^{22}.3^7-9^{15}}{\left(2.3^{14}\right).2}\)

\(=\) \(\frac{11.3^{22+7}-\left(3^2\right)^{15}}{2^2.\left(3^{14}\right)^2}\)

\(=\) \(\frac{11.3^{29}-3^{30}}{4.3^{28}}\)

\(=\) \(\frac{11.3^{29}-3^{29}.3}{4.3^{28}}\)

\(=\) \(\frac{3^{29}\left(11-3\right)}{3^{28}.4}\)

\(=\) \(\frac{3^{28}.3.8}{3^{28}.4}\)

\(=\) \(\frac{3^{28}.3.4.2}{3^{28}.4}\)

\(=\) \(6\)

Chúc bn hok tốt ~

\(D=\frac{11.3^{22}.3^7-9^{15}}{\left(2.3^{14}\right).2}\)

\(=\frac{11.3^{22+7}-\left(3^2\right)^{15}}{2^2.\left(3^{14}\right)^2}\)

\(=\frac{11.3^{29}-3^{30}}{4.3^{28}}\)

\(=\frac{11.3^{29}-3^{29}.3}{4.3^{28}}\)

\(=\frac{3^{29}\left(11-3\right)}{3^{28}.4}\)

\(=\frac{3^{28}.3.8}{3^{28}.4}\)

\(=\frac{3^{28}.3.4.2}{3^{28}.4}=6\)

\(D=\frac{11.3^{22}.3^7-9^{15}}{\left(2.3^{14}\right).2}=\frac{11.3^{22+7}-\left(3^2\right)^{15}}{2^2.\left(3^{14}\right)^2}\)

\(=\frac{11.3^{29}-3^{30}}{4.3^{28}}=\frac{11.3^{29}-3^{29}.3}{4.3^{28}}\)

\(=\frac{3^{29}\left(11-3\right)}{3^{28}.4}=\frac{3^{28}.3.8}{3^{28}.4}\)

\(=\frac{3^{28}.3.4.2}{3^{28}.4}=6\)

1. 5³ = 5.5.5 = 125

2. 2⁷ = 2.2.2.2.2.2.2 = 128

3. 4⁴ = 4.4.4.4 = 256

4. 7³ = 7.7.7 = 343

6. 3⁵ = 243

7. 2⁶ =  64

8. 3⁴ =  81

9. 8³ =  512

11. 13² = 169

12. 11² = 121

13. 14² = 196

14. 15² = 225

16. 17² = 289

17. 18² = 324

18. 19² = 361

19. 20² = 400

21. 10⁴ = 10000

22. 10⁵ = 100000

23. 10⁶ = 1000000

24. 10⁷ = 10000000

bạn làm như bạn gia hân là đúng nhé

giải giúp mình bài 2 trên với ạ

e, 2^x.4 = 128

<=> 2^x . 2² = 2⁷

=> x + 2 = 7

<=> x = 5

Vậy x = 5

f , ( x - 5)⁴ = (x - 5)⁶

<=> ( x - 5)⁴ - (x - 5)⁶ =0

<=> (x - 5)⁴. [1 - (x - 5)²] = 0

<=> (x - 5)⁴ (1 - x + 5)(1 + x - 5) = 0

<=> (x - 5)⁴ (6 - x)(x - 4) = 0

<=> \(\left[{}\begin{matrix}x-5=0\\6-x=0\\x-4=0\end{matrix}\right.\) <=> \(\left[{}\begin{matrix}x=5\\x=6\\x=4\end{matrix}\right.\)

Vậy x ={5; 6; 4}

49 . 7^x = 2041

<=> 7². 7^x = 7⁴

=> 2 + x = 4

<=> x = 2

Vậy x = 2

a,( 3⁹³+3⁹⁰) : (3¹⁷. 3⁷³)

= (3³+1). 3⁹⁰ : 3⁹⁰

= 3³+1

=27+1

=28

b,(5⁵⁶+5⁷) : (5⁴⁹+1)

=5⁷. (5⁴⁹+1) : (5⁴⁹+1)

=5⁷= 78125

c,(7²²+7²¹+7²⁰) ; (2⁵+2⁴+3²)

= 7²⁰. (7²+7¹+1) : [2⁴. (2+1)+3² ]

= 7²⁰. 57 : [ 2⁴. 3 +3² ]

= 7²⁰. 57 :  ( 2⁴+3) . 3

= 7²⁰. 57 :  19 . 3

= 7²⁰. 57 : 57

= 7²⁰