a) x - 143 = 716 - 659

    x - 143  = 57

      x         = 57 + 143

      x          = 200

b) (x - 5) x 3 = 3³

=> (x-5) x 3 = 27

=> x-5        = 27 : 3

=> x - 5       =  9

=> x              = 9 + 5

=> x               = 14

c và d làm tương tự 

\(a,5^{16}:5^{13}+2.2^4-2018^0\)

\(=5^3+2^5-1\)

\(=125+25-1=150-1=149\)

sao trả lời ít vậy

a.219 - 7(x+1) = 100

7(x+1) = 219 - 100 

7(x+1) = 119

x + 1 = 119 : 7

x + 1 = 17

x = 17 - 1 

x = 16

b. (3x - 6 ) .  3 = 36

3x - 6 = 36 : 3 

3x - 6 = 12

3x = 12 + 6 

3x = 18

x = 18 : 3

x = 6

c.716 - ( x-143) = 659

x-143 = 716 - 659

x-143 = 57

x = 57 + 143

x = 200

b. 30 - [4(x-2)+15] = 3

4(x-2) + 15 = 30 - 3

4(x-2)+15 = 27

4(x-2) = 27 - 15

4(x-2) = 12

x-2 = 12 : 4

x-2 = 3

x = 2 + 3 = 5

e.[(8x - 12) : 4] .3³ = 3⁶

[(8x - 12) : 4] . 27 = 729

(8x - 12) : 4 = 729 : 27 = 27

8x - 12 = 27 . 4 = 108

8x = 108 + 12 = 120

x = 120 : 8 = 15

a) \(\Leftrightarrow7\left(x+1\right)=119\\ \Leftrightarrow x+1=17\\ \Leftrightarrow x=16\)

b) \(\Leftrightarrow9\left(x-2\right)=36\\ \Leftrightarrow x-2=4\\ \Leftrightarrow x=6\)

c) \(\Leftrightarrow x-143=57\\ \Leftrightarrow x=200\)

d) \(\Leftrightarrow4\left(x-2\right)+15=27\\ \Leftrightarrow4\left(x-2\right)=12\\ \Leftrightarrow x-2=3\\ \Leftrightarrow x=5\)

e) \(\Leftrightarrow\left(2x-3\right).4:4=3^3\\ \Leftrightarrow2x-3=27\\ \Leftrightarrow2x=24\\ \Leftrightarrow x=12\)

a)67.153-53.67+712:8

=67.(153-53)+89

=67.100+89

=6789

\(a,67\times153-53\times67+712:8\)

\(=67\times\left(153-53\right)+\left(712:8\right)\)

\(=67\times100+89\)

\(=6700+89\)

\(=6789\)

\(b,168-\left\{5\times\left[143-\left(15-12\right)^2\right]+10\right\}:10\)

\(=168-\left\{5\times\left[143-3^2\right]+10\right\}:10\)

\(=168-\left\{5\times134+10\right\}:10\)

\(=168-\left\{670+10\right\}:10\)

\(=168-680:10\)

\(=168-68\)

\(=100\)

\(c,\left(-13\right)+84+\left(-87\right)+16\)

\(=13+84-87+16\)

\(=\left(13+87\right)-\left(84+16\right)\)

\(=100-100\)

\(=0\)

\(d,9-\left(12-15\right)\)

\(=9-\left(-3\right)\)

\(=12\)

a) \(93+3\left(x-5\right)=3.5^2=75\\ =>3\left(x-5\right)=75-93=-18\\ =>x-5=\dfrac{-18}{3}=-6\\ =>x=-6+5=-1\)

b, \(\left(5x^3+2^2.11\right):3^2=5\\ < =>\left(5x^3+44\right):9=5\\ =>5x^3+44=5.9=45\\ =>5x^3=45-44=1\\ =>x^3=\dfrac{1}{5}\\ =>x=\sqrt[3]{\dfrac{1}{5}}\)

ko hiểu

toàn là bài dễ, những phương trình này đơn giản mà bạn

(x-7).(2x-8)=0

suy ra :(x-7)=0   suy ra x=7

           2x-8=0   suy ra x=4

Câu b:

( x-40) .15 =15.3

 (x-40) .15=45

(x-40)      = 45:15

x-40         = 3

x=43

Bài 1: Tìm x biết:

a )  (x-7).(2x-8)=0

=>x-7=0 hoặc 2x-8=0

=>x=7 hoặc x=4

b)   (x-40).15=15.3

=>(x-40).15=45

=>x-40=45:15

=>x-40=3

=>x=3+40

=>x=43