a.390 - (x - 7) = 169 : 13

390 - (x - 7) = 13

x - 7 = 390 - 13

x = 377 + 7

x = 384

b.(x - 140) : 7 = 3³ - 2³.3

(x - 140) : 7 = 3

x - 140 = 3 . 7

x = 21 + 140

x = 161

c.x - 6:2 - (48-24):2: 6-3 = 0

x - 3 -2 - 3 = 0

x = 3 + 2 + 3

x = 8

\(a.390-\left(x-7\right)=169:13\)

    \(390-\left(x-7\right)=13\)

                   \(\left(x-7\right)=390-13\)

                         \(x-7=377\)

                                  \(x=377+7\)

                          Vậy \(x=384\)

\(b.\left(x-140\right):7=3^3--2^3.3\)

    \(\left(x-140\right):7=3^3+2^3.3\)

    \(\left(x-140\right):7=27+8.3\)

    \(\left(x-140\right):7=27+24\)

    \(\left(x-140\right):7=51\)

        \(\left(x-140\right)=51.7\)

              \(x-140=357\)

                             \(x=357+140\)

                      Vậy \(x=497\)

\(c.x-6:2-\left(48-24\right):2:6-3=0\)

                          \(x-3-24:2:6-3=0\)

                              \(x-3-12:6-3=0\)

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

                                             \(x-\left(-2\right)=0\)

                                                       \(x+2=0\)

                                                                \(x=0-2\)

                                                        Vậy \(x=-2\)

Chúc bạn học tốt nha!

a,7.x-8=6

x-8=6:7

x-8=6/7

x=6/7+8

x=62/7

Vậy x=62/7

b, 8.(x-5)=0

x-5=0:8

x-5=0

x=0+5

x=5

Vậy x = 5

c, x -6:2-(48-24.2:6-3)=0

x-6:2-(48-48:6-3)=0

x-6:2-(48-8-3)=0

x-6:2-(40-3)=0

x-6:2-37=0

x-6:2=0+37

x-3=37

x=37+3

x=40

Vẫy=40

Tích đi mình trả lời

Ta có :

\(3^{2n}=\left(3^2\right)^n=9^n\)

\(2^{3n}=\left(2^3\right)^n=8^n\)

Vì \(9>8\)\(\Rightarrow9^n>8^n\)

Hay \(3^{2n}>2^{3n}\)

Vậy  \(3^{2n}>2^{3n}\)

_Chúc bạn học tốt_

1.   x-6:2-(48-24):2:6-3=0

      x-6:2-(48-24):2:6=3

      x-6:2-24:2:6=3

      x-6:2-12:6= 3

      x-3-2=3

      x-3=5

       x= 8

Vậy x=8

x - 6 : 2 ( 48 - 24 ) : 2 : 6 - 3 = 0

x - 6 : 2 . 24 : 2 : 6 - 3 = 0

x - 6 - 3 = 0

x - 9 = 0

     x = 9

x-6:2 ( 48-24) :2 :6 - 3 = 0

=>x-6:2(48-24):2:6= 3

=> x-6:2(48-24):2 = 18

=> x-6:2(48-24)= 36

=> x- 6:2. 24= 36

=> x- 6: 48= 36

=>x +8=36

=> x= 36-8

=>x= 28

x - 6 : 2 (48 - 24) : 2 : 6 - 3 = 0

x-6:2(24):2:6 =3

x-6:48 =3.6.2

x-6:48 =36

x-6 =36.48

x-6 =1728

x =1734

  x + 5 . 2 - ( 32 + 16 . 3 : 6 - 15 ) = 0

  x + 10 - ( 32 + 8 - 15 ) = 0

  x + 10 - 25 = 0

  x - 15 = 0

  x = 15

  x - 6 : 2 - ( 48 - 24 ) : 2 : 6 - 3 = 0

  x - 3 - 24 : 2 : 6 - 3 = 0

  x - 3 - 2 = 0

  x - 5 = 0

  x = 5 

x + 5 . 2- (32+48:6-15)=0

x+5.2-(32+8-15)=0

x+5.2-25=0

x+10=0+25=25

x=25-10

x=15

cau sau cung tuong tu nhu zay

tự làm nha

nhớ k đó

X-6:2-(48-24):2:6=0+3

X-6:2-(48-24):2:6=3

X-6:2-(48-24):2=3x6

X-6:2-(48-24):2=18

X-6:2-(48-24)=18x2

X-6:2-(48-24)=36

X-3-24=36

X-3=36+24

X-3=60

X=60+3

X=63

x-6:2-(48-24):2:6-3=0

=> x-3-24:2:6-3=0

=> x-3-2-3=0

=> x=0+3+2+3

=> x=8

x-6:2-(48-24):2:6-3=0

=> x-3-24:2:6-3=0

=> x-3-2-3=0

=> x= 0+3+2+3

=> x=8