dễ thương quá minion 

d, X/8*32+X/3*18-X/5*10=120

   X*32/8+X*18/3-X*10/5=120

  32X/8+18X/3-10X/5=120

  4X+6X-2X=120

  8X=120

 X=120/8

X=15

a, ( 25 * 12 - X - 25 ) : 25 = 4

( 25 * 12 - x - 25 )           = 4 * 25 

( 25 * 12 - x - 25 )           = 100

300 - x - 25                    = 100

300 - x                           = 100 + 25

300 - x                           = 125

x                                   = 300 - 125

x                                   = 175

\(15-3\left(x-2\right)=21\)

\(\Leftrightarrow15-3x+6=21\)

\(\Leftrightarrow21-3x=21\)

\(\Leftrightarrow-3x=0\)

\(\Leftrightarrow x=0\)

Vậy ...

\(25+4\left(3-x\right)=1\)

\(\Leftrightarrow25+12-4x=1\)

\(\Leftrightarrow37-4x=1\)

\(\Leftrightarrow4x=36\)

\(\Leftrightarrow x=9\)

Vậy ...

15-3(x-2)=21

3(x-2)=15-21

3(x-2)=-6

x-2=-6:3

x-2=-2

   x=-2+2

   x=0

vậy x=0

25+4(3-x)=1

4(3-x)=1-25

4(3-x)=-24

3-x=-24:6

3-x=-4

   x=3-(-4)

   x=7

vậy x=7

1)[x-128+20] :192=0

    x-128+20        = 192

    x-128              = 192-20

    x-128              = 172

    x                     = 172+128

    x                     = 300

2) bạn nhớ check lại câu này giùm Nhi nha!

3) 460+85.4 = [ x+200] .4

    460+ 340 = 4x+ 800

     4x+800   = 800

      4x         = 800-800

      4x         = 0

        x         = 0:4

        x         = 0

bạn nhai ơi ban giải thích cho mình câu a đc ko vì sao lại bằng 192 chả nhẽ ko nhân hay làm gì với số ko ạ

3) \(-12+2x-9+x=0\\ -21+3x=0\\ 3x=21\\ x=7\)

4)
\(11+\left(15-x\right)=1\)
\(15-x=1-11\)
\(15-x=-10\)
\(x=15-\left(-10\right)\)
\(x=25\)

5) 
\(4-\left(27-3\right)=x-\left(13-4\right)\)
\(4-24=x-9\)
\(x-9=-20\)
\(x=-20+9\)
\(x=-11\)
 

\(3.-12+\left(2x-9\right)+x=0.\)

\(\Leftrightarrow-12+2x-9+x=0.\Leftrightarrow3x=21.\Leftrightarrow x=7.\)

Vậy \(x=7.\)

\(4.11+\left(15-x\right)=1.\Leftrightarrow11+15-x=1.\Leftrightarrow26-x=1.\Leftrightarrow x=25.\)

Vậy \(x=25.\)

\(5.4-\left(27-3\right)=x-\left(13-4\right).\Leftrightarrow4-24=x-9.\Leftrightarrow-20=x-9.\Leftrightarrow x=-11.\)

Vậy \(x=-11.\)

\(6.8-\left(x-10\right)=23-\left(-4+12\right).\Leftrightarrow8-x+10=23-8.\Leftrightarrow18-x=15.\Leftrightarrow x=3.\)

Vậy \(x=3.\)

\(7.105-5\left(10-5x\right)=-20.\Leftrightarrow105-50+25x=-20.\Leftrightarrow25x=-75.\Leftrightarrow x=-3.\)

Vậy \(x=-3.\)

\(8.\left(x-1\right)\left(8-2x\right)\left(3x+123\right)=0.\)

\(\Leftrightarrow\left[{}\begin{matrix}x-1=0.\\8-2x=0.\\3x+123=0.\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=1.\\x=4.\\x=-41.\end{matrix}\right.\)

Vậy \(x\in\left\{1;4;-41\right\}.\)

\(9.\left(x^2-25\right)\left(x+10\right)=0.\)

\(\Leftrightarrow\left(x-5\right)\left(x+5\right)\left(x+10\right)=0.\)

\(\Leftrightarrow\left[{}\begin{matrix}x-5=0.\\x+5=0.\\x+10=0.\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=5.\\x=-5.\\x=-10.\end{matrix}\right.\)

Vậy \(x\in\left\{5;-5;-10\right\}.\)

\(10.x\left(x^2+5\right)=0.\Leftrightarrow x=0.\)

(-25)-(5.x-3)=4

5.x-3 = -25 - 4

5.x-3=-29

5.x=-26

x=-26/5

x=-5,2

5.x-6=20-(12-6)

5.x-6=20-6

5.x-6=14

5.x=20

x=20:5

x=4

vậy x=4

1/
-25-(5x-3)=4
-25-4=5x-3
-25-4+3=5x
5x= -26
x= -26/5
2/
5x-6=20-(12-6)
5x = 20-12+6+6
5x = 20
x = 20/5 = 4
3/
-2x -40 = (5-x) -(-15+60
-2x -40 = 5-x +15-60
-2x +x = 5+15-60+40
-x = 0
x=0

x:15+42=15+25 .8

x:15+42=15+200

x:15+42=215

x:15=215-42

x:15=158

x=158:15

x=158/15

mình ko có thời gian nên mình làm gọn:

x=158/15

mình học lớp 12 mà

x : 15 + 42 = 15 + 25 . 8

x : 15 + 42 = 15 + 200

x : 15 + 42 = 215

x : 15         = 215 - 42

x : 15         = 158

x                = 158 : 15

x                = 158/15 = 10,5333

a, 1-[15+11­] = x-[25-9]

1-16=x-16

-15=-x-16

x=-15+16

x=1

b,2-x=17-[-5]

2-x=17+5

2-x=22

x=2-22

x=-20

c, x-12=[-9­]-15

x-12=-24

x=-24+12

x=-12

d,9-25=[ 7- x­] -[25+7]

-16=[7-x]-32

[7-x]-32=-16

7-x=-16+32

7-x=16

x=7-16

x=-9

3.5^x=60.5⁸+15.25⁴

=>3.5^x=12.5.5⁸+3.5.(5²)⁴

=>3.5^x=12.5⁹+3.5⁹

=>3.5^x=(12+3).5¹⁹

=>3.5 ^x=15.5⁹=3.5.5⁹

=>3.5^x=3.5¹⁰

=> x=10

Tk mk

3.5^x=60.5⁸+15.25⁴

=> 3.5^x=60.5⁸+15.(5²)⁴

=>3.5^x=60.5⁸+15.5⁸

=>3.5^x=5⁸.(60+15)

=>3.5^x=5⁸.75

=>3.5^x=5⁸ . 25.3(75=25..3)

=>3.5^x=5⁸.5².3

=>3.5^x=5¹⁰.3

=> x=10

Chúc bạn học tốt!