Ta tách 9 x 24 ra 27 x 8

(77 + 8 + 15) x 27

= 100 x 27

= 2700

\( 27 - x + 15 + x = x - 24\\ \Leftrightarrow 42 = x - 24\\ \Leftrightarrow x = 66 \)

(27 - x) + (15 + x) = x - 24

⇔ x - 24 = 42

⇔ x = 66

Vậy x = 66 là nghiệm của pt

tui lam dc roi :((((

17 - 2x = -15

2x = 17 - (-15)

2x = 32

x = 32 : 2

x = 16

--------

54 : (x + 2) = -6

x + 2 = 54 : (-6)

x + 2 = -9

x = -9 - 2

x = -11

--------

12.(3 - x) = 72

3 - x = 72 : 12

3 - x = 6

x = 3 - 6

x = -3

-------

-3(x + 5) + 18 = -27

-3(x + 5) = -27 - 18

-3(x + 5) = -45

x + 5 = -45 : (-3)

x + 5 = 15

x = 15 - 5

x = 10

-------

(x + 5)² = 9

x + 5 = 3 hoặc x + 5 = -3

*) x + 5 = 3

x = 3 - 5

x = -2

*) x + 5 = -3

x = -3 - 5

x = -8

Vậy x = -8; x = -2

--------

(3 - x)³ = 27

(3 - x)³ = 3³

3 - x = 3

x = 3 - 3

x = 0

=00

- 3\(x\) + 24  = -24

  3\(x\)          = 24 + 24

   3\(x\)          = 48

     \(x\)           = 48 : 3

     \(x\)           = 16

(27-x)+(15+x)=x-24

=> 27- x + 15 + x -x + 24 = 0 (chuyển vế)

=> -x + 66 = 0

=> -x = -66

=> x =66

(27-x)+(15+x)=x-24

     27-x+15+x=x-24

            -x+x-x=-24-27-15

                   -x=-66

                     x=66

Vậy x=66

\(\left(27-x\right)+\left(15+x\right)=x-24\)

<=>\(27-x+15+x=x-24\)

<=>\(-x+x-x==24-15-27\)

<=>\(-x=-18\)

<=>\(x=18\)

                   Bài làm

(15 + x) - (x - 27) =  x - 24

15 + x - x + 27 = x -24

(15 + 27) + ( x - x) = x - 24

x - 24 = 42

       x = 42 - 24

       x = 18 

Vậy x = 18

Học & Tốt

\(\left(27-x\right)+\left(15+x\right)=x-24\)

\(27-x+15+x=x-24\)

\(-x+x-x=-24-15-27\)

\(-x=-66\)

\(\Rightarrow x=-66\)

\(\left(27-x\right)+\left(15+x\right)=x-24\)

\(27-x+15+x=x-24\)

\(32-x+24=0\)

\(56-x=0\)

\(x=56\)

(27 - x) + (15 + x) = x - 24

27 - x + 15 + x = x - 24

27 + 15 + 24 = x + x - x

66 = x

Vậy x = 66

Chúc bạn học tốt !

(27-x)+(15+x) = x-24 

27-x+15+x = x-24

27-15-x+x = x-24

12 = x-24

x-24 = 12

x =  36

\(\left(27-x\right)+\left(15+x\right)=x-24\\ 27-x+15+x=x-24\\ 27+15+\left(x-x\right)=x-24\\ x-24=42\\ x=24+42=66\)

Vậy x = 66

a)\(x-5=-1\)

⇔\(x=4\)

b)\(x+30=-4\)

⇔\(x=-34\)

c)\(x-\left(-24\right)=3\)

⇔\(x+24=3\)

⇔\(x=-21\)

e)\(\left(x+5\right)+\left(x-9\right)=x+2\)

⇔\(x+5+x-9-x-2=0\)

⇔\(x-6=0\)

⇔\(x=6\)

f)\(\left(27-x\right)+\left(15+x\right)=x-24\)

⇔\(27-x+15+x-x+24=0\)

⇔\(66-x=0\)

⇔\(x=66\)

\(a.x-5=-1\)                      \(b.x+30=-4\)

\(x=\left(-1\right)+5\)                        \(x=\left(-4\right)-30\)

\(x=4\)                                    \(x=-34\)

\(c.x-\left(-24\right)=3\)                    \(e.\left(x+5\right)+\left(x-9\right)=x+2\)

\(x=3+\left(-24\right)\)                         \(x+5+x-9=x+2\)

\(x=-21\)                                  \(2x-4=x+2\)

                                                \(2x-x=2+4\)

                                                 \(x=6\)

\(f.\left(27-x\right)+\left(15+x\right)=x-24\)

\(27-x+15+x=x-24\)

\(27+15=x-24\)

\(42=x-24\)

\(x=24+42\)

\(x=66\)