13,45 + 7,98 + 8,55

= 21,43 + 8,55 

= 29,98

9,79 + 8,38 + 3,62

= 18,17 + 3,62

= 21,79

45,37 - 29,73 + 3,62

= 15,64 + 3.62

= 19,26

45,71 - 7,41 - 2,59

= 32,30 - 2,59

= 29,71

X * 3^1/3 = 3^1/3  * 4^1/4 < => X= \(\frac{3^{\frac{1}{3}}\cdot4^{\frac{1}{4}}}{3^{\frac{1}{3}}}\)<=> X = 4^1/4

7,15 : 3,62 = 1,9751381

lam tron thanh 2 nha

7,15:3,62=1,9751

mk hiểu mà!!!

\(x\cdot\frac{16}{4}=0,18+3,62\)

\(x\cdot4=0,18+3,62\)

\(x\cdot4=3,8\)\(x=3,8:4=0,95\)

x*16/4=0,18+3,62

x*16/4=3.8

x*4=3,8

=>x=0,95

vay x=0,95

Câu a:

5.2\(^2\) + x + 3 = 5\(^2\)

5.4 + x +3 = 25

20 + x + 3 = 25

x = 25- 20 - 3

x = 5 - 3

x = 2

Vậy x = 2

Câu b:

2\(^3\) + x - 3\(^2\) = 5\(^3\) - 4\(^3\)

8 + x - 9 = 125 - 64

x = 125 - 64 + 9 - 8

x = 61 + 9 - 8

x = 70 - 8

x = 62

Vậy x = 62

A=100-(25*4-64*3)+8=100-(100-192)+8=100-100+192+8=(100-100)+(192+8)=0+200=200

A = 10^2 - (5^2.4 - 4^3.3) + 2^3

A = 100 - (25.4 - 64.3) + 8

A = 100 - 100 + 192 + 8

A = 0 + 192 + 8

A = 200

a, T=3¹².4⁶/6¹⁰

    T=3¹².(2²)⁶/(2.3)¹⁰

     T=3¹².2¹²/2¹⁰.3¹⁰

   T=3².2²

   T=9.4

   T=36

Câu a:

T = 3\(^{12}\). \(\frac{4^6}{6^{10}}\)

T = \(\frac{3^{12.}2^{12}}{3^{10}.2^{10}}\)

T = 3^2.2^2

T = 9.4

T = 36

a/ 440 + 2 [ 125 - x ] = 546 

==> 2 [ 125 - x ] = 546 - 440 

==> 2 [ 125 - x ] 106 

==> 125 - x = 106 : 2 

==> 125 - x = 53  ==> x = 125 - 53 =72 

b/ 7x - 3³ = 2⁷ : 2⁴ 

==> 7x - 27 = 2^7-4 = 2³ = 8 

==> 7x = 8+ 27 

==> 7x = 35  ==> x = 35 : 7 = 5

c/  [ 12x - 4³ ] . 8³ = 4 . 8⁴ 

==> [ 12x - 2⁶ ] . 2⁹ = 2² . 2¹² 

==> [ 12x - 2⁶ ] . 2⁹ = 2¹⁴ 

==> [ 12x - 2⁶ ] = 2¹⁴ : 2⁹ = 2⁵ 

==>. 12x = 2⁵ + 2⁶ = 96 

==> x = 96 : 12 = 8

d/ 123 - 5. [ x + 4 ] = 38 

==> 5. [ x + 4 ] = 123 - 38 

==> 5. [ x + 4 ] = 85 

==> x + 4 = 85 : 5

==> x + 4 = 17 

==> x = 17 - 4 = 13 

e/ [ 2600 + 6400 ] - 3.x = 1200

==> 9000 - 3x = 1200

==> 3x = 9000 -1200 = 7800 

==> x = 7800 : 3 = 2600

f/ x² - 72 : 36 = 23 

==> x² - 2 = 23 

==> x² = 23 + 2 

==>x² = 25 

==> x² = 5² 

==> x = 5