\(3,2x-\left(\dfrac{4}{5}+\dfrac{2}{3}\right):3\dfrac{2}{3}=\dfrac{7}{20}\\ \Rightarrow\dfrac{16}{5}x-\dfrac{22}{15}:\dfrac{11}{3}=\dfrac{7}{20}\\ \Rightarrow\dfrac{16}{5}x-\dfrac{2}{5}=\dfrac{7}{20}\\ \Rightarrow\dfrac{16}{5}x=\dfrac{3}{4}\\ \Rightarrow x=\dfrac{15}{64}\)

\(\left(4\dfrac{1}{2}-2x\right).1\dfrac{4}{61}=6\dfrac{1}{2}\\ \Rightarrow\left(\dfrac{9}{2}-2x\right).\dfrac{65}{61}=\dfrac{13}{2}\\ \Rightarrow\dfrac{9}{2}-2x=\dfrac{61}{10}\\ \Rightarrow2x= -\dfrac{8}{5}\\ \Rightarrow x=-\dfrac{4}{5}\)

\(\text{1,(-14)+(2x–4^2)=/-10/×/5/}\)

\(-14-16+2x=10.5\)

\(-30+2x=50\)

\(2x=50--30\)

\(2x=80\)

\(x=80:2\)

\(x=40\)

\(\text{2,(-100)–/x+20/=-150}\)

\(|x+20|=-100--150\)

\(|x+20|=50\)

\(\Rightarrow\orbr{\begin{cases}x+20=50\\x+20=-50\end{cases}\Leftrightarrow\orbr{\begin{cases}x=30\\x=-70\end{cases}}}\)

\(\Rightarrow x\in\left\{-70;30\right\}\)

\(\text{3)3x+16=4x–61}\)

\(3x-4x=-61-16\)

\(-x=-77\)

\(\Rightarrow x=77\)

\(\text{4,2(x–5)–3(x+6)=0}\)

\(2x-10-3x-18=0\)

\(2x-3x=0+18+10\)

\(-x=28\)

\(x=-28\)

chúc bạn học tốt

\(x=80\)

1. Tìm x

a, -( x - 61 ) + |+32| = 9

-x + 61 + 32 = 9

-x + 93 = 9

-x = -84

x = 84

b, -86 + |x-15| = (-3)²

|x-15| = 9 + 86

|x-15| = 95

TH1: x - 15 = 95

x = 110

TH2: x - 15 = -95

x = -80

2. Thực hiện phép tính

a, (-8).(-9) + (-14):2 - (-8)²

= 72 - 7 - 64

= 1

b, (-10).(-7) + 306:(-9) - (-5)³

= 70 - 34 + 125

= 161

c, (-4)³ + (-11).(+8) - (-15):(-5)

= -64 - 88 - 3

= -155

d, (-13).(+7) - (-20):(+4) + (-5)²

= -91 + 5 + 25

= -61

Chúc bạn học tốt !

1) 

a) 315 + ( 125 - x ) = 435 

125 - x = 435 - 315

125 - x = 120 

x = 125 - 120 

x = 5

b) ( x - 105 )  : 2 = 15 

x - 105 = 15 . 2 

x - 105 = 30 

x = 30 + 105 

x = 135 

c) ( x : 23 + 45 ) . 67 = 8911 

x : 23 + 45 = 8911 : 67 

x : 23 + 45 = 133

x : 23 = 133 - 45 

x : 23 = 88 

x = 88 . 23 

x = 2024 

d) 5 . x - 20 = 3 . ( x - 2 )

x = 7 ( Mình không biết cách trình bày nhưng mình biết kết quả ) 

2)

a) 2783 + 461 + 217 - 61 = ( 2783 + 217 ) + ( 461 - 61 )

= 3000 + 400 = 3400

b) 123 . 456456 - 456 . 123123 = 0

125-3.(x+2)³=61

       3.(x+2)³=125-61

       3.(x+2)³=64

          (x+2)³=64:3

          (x+2)³=\(\frac{64}{3}\)

           (x+2)³=(\(\frac{4}{1}\))³

            x+2   =4

            x       =4-2

            x       =2