a: \(\Leftrightarrow73-x=67\)

hay x=6

\(\Leftrightarrow7x-11=20\)

hay x=31/7

a. 25 + 3(x-8) = 106

3(x-8) = 106 - 25 = 81

x -8 = 81 : 3 = 27

x = 27 +8 = 35

b. 3²(x +4) - 5² = 5.5²

9(x+4) - 25 = 5.25 = 125

9(x+4) = 125 + 25 = 150(Đề sai)

Ta có:

\(5^x+5^{x+2}=210\)

\(\Leftrightarrow5^x\left(1+5^2\right)=210\)

\(\Leftrightarrow5^x\cdot26=210\)

\(5^x=\frac{105}{13}\)

a) \(\left(x-1\right)^2=49\)

\(\Rightarrow\left(x-1\right)^2=7^2=\left(-7\right)^2\)

\(\Rightarrow x-1=7\)                        hoặc                           \(x-1=-7\)

\(x=7+1=8\)                                                                \(x=-7+1=-6\)

Vậy x = 8 hoặc x = - 6

b) \(3\cdot\left(13-x\right)^2=27\)

\(\left(13-x\right)^2=27\div3=9\)

\(\Rightarrow\left(13-x\right)^2=3^2=\left(-3\right)^2\)

\(\Rightarrow13-x=3\)                                          hoặc                                    \(13-x=-3\)

\(x=13-3=10\)                                                                                            \(x=13+3=16\)

Vậy x = 10 hoặc x = 16

c) \(164-\left(15-x\right)^3=100\)

\(\left(15-x\right)^3=164-100=64\)

\(\Rightarrow\left(15-x\right)^3=4^3\)

\(\Rightarrow15-x=4\)

\(x=15-4=11\)

Vậy x = 11

d) \(\left(x+3\right)^3-15=210\)

\(\left(x+3\right)^3=210+15=225\)

\(\Rightarrow\left(x+3\right)^3=...\)

Tương tự mũ lẻ cậu nhé

e) \(x^2\div4=16\)

\(x^2=16\cdot4=64\)

\(\Rightarrow x^2=8^2=\left(-8\right)^2\)
Vậy x = 8 hoặc x = - 8

a/\(\left(x-1\right)^2\)=49

\(\left(x-1\right)^2\)=\(7^2\)

=>x-1=7

x=7+1

x=8

b/3.\(\left(13-x\right)^2\)=27

\(\left(13-x\right)^2\)=27:3

\(\left(13-x\right)^2\)=9

\(\left(13-x\right)^2\)=\(3^2\)

=>13-x=3

x=13-3

x=10

c/164-\(\left(15-x\right)^3\)=100

\(\left(15-x\right)^3\)=164-100

\(\left(15-x\right)^3\)=64

\(\left(15-x\right)^3\)=\(4^3\)

=>15-x=4

x=15-4

x=11

d/\(\left(x+3\right)^3\)-15=210

\(\left(x+3\right)^3\)=210+15

\(\left(x+3\right)^3\)=225

sai đề bài câu d hay sao ý bạn ạ 

chỉ có \(\left(x+3\right)^2\)thì mới tính được

e/\(x^2\):4=16

\(x^2\)=16.4

\(x^2\)=64

\(x^2\)=\(8^2\)

=>x=8

a) \(5^5\)

b) \(5^7\)

c) \(5^{19}\)

d) \(10^3\)

e) \(10.10^2.10^4.10^4=10^{11}\)

a)210-5x=200

5x=210-200

5x=10

x=10:2

x=5

B)210-5(x-10)=200

5(x-10)=210-200

5(x-10)=10

x-10=10:5=2

x=2+10=12

c)450:[41-(2x-5)]=3 mũ 2 .5

450:[41+5-2x]=45

41+5-2x=450:45

41+5-2x=10

2x=36

x=18

D)210:x-10=20

210:x=20+10

210:x=30

x=210:30

x=7

E)(5x-39).7+3=80

(5x-39).7=77

5x-39=11

5x=50

x=10

F(2x+1):7=2 mũ 2 nhân 3 mũ 2

(2x+1):7=36

2x+1=252

2x=251

x=251/2