\(\Leftrightarrow x-15=132:11\Leftrightarrow x-15=12\Leftrightarrow x=12+15=27\)

\(\Leftrightarrow x=15-20\Leftrightarrow x=-5\)

\(11(x-15)=132=>11x-55=132=>11x=187=>x=187:11=17\)

\(15-x=20=>x=15-20=>x=-5\)

Chúc em học tốt

\(\text{11.(x – 15) = 132 }\\ \text{(x – 15) = 132:11 }=12\\ x=12+15=27\)

\(\text{15 – x = 20}\\ x=15-20=-5\)

  (57869-297:1x108)x(180:15-132:11)

= 25793 x 0

= 0

=(57869-297:11.108).0

=0

(57869-297:1x108) x (180:15-132:11)

= (57869-297:1x108) x (12 - 12)

= (57869-297:1x108) x 0

= 0

Ta có : 3(2x - 4) + 11 = -11

=> 3(2x - 4) = 0

Mà 3 khác 0 

Nên : 2x - 4 = 0

=> 2x = 4

=> x = 2

a) \(\dfrac{x}{15}=3\Rightarrow x:15=3\Rightarrow x=3\cdot15\Rightarrow x=45\)

Vậy x = 45

b) \(\dfrac{132}{x}=11\Rightarrow132:x=11\Rightarrow x=\dfrac{132}{11}\Rightarrow x=12\)

Vậy x = 12

a) \(\dfrac{x}{15}=3\Rightarrow x=45\)

b) \(\dfrac{132}{x}=11\Rightarrow x=12\)

Mk khong viet de dau nha!!!

a>x=10.36/-12

    x=-30

b>x=-21.3/0,7

    x=-90

c>x=-7.132/11

    x=-84

d>30.5x=48

         5x=4

            x=4/5

e>90=-2x.(-4)

      -2x=90/(-4)

       -2x=-22,5

          x=-22,5/-2

           11,25

Nho click cho mk nha!!!

1)

a) 2x + 5 = 3⁴ : 3²

2x + 5 = 3²

2x + 5 = 9

2x = 9 - 5

2x = 4

x = 4 : 2

x = 2

b) (3x - 24).73 = 2.74

(3x - 24).73 = 148

3x - 24 = 148/73

3x = 148/73 + 24

3x = 1900/73

x = 1900/73 : 3

x = 1900/219

c) [3.(42 - x)] + 15 = 23.3

126 - 3x + 15 = 69

141 - 3x = 69

3x = 141 - 69

3x = 72

x = 72 : 3

x = 24

d) 126 + (132 - x) = 300

132 - x = 300 - 126

132 - x = 174

x = 132 - 174

x = -42

2)

a) 120 - (x + 55) = 60

x + 55 = 120 - 60

x + 155 = 60

x = 60 - 55

x = 5

b) (7x - 11).3 = 25.52 + 200

(7x - 11).3 = 1500

7x - 11 = 1500 : 3

7x - 11 = 500

7x = 500 + 11

7x = 511

x = 511 : 7

x = 73

c) 2x + 2x + 4 = 544

4x = 544 - 4

4x = 540

x = 540 : 4

x = 135

3) 

a) 10 + 2x = 49 : 47

10 + 2x = 49/47

2x = 49/47 - 10

2x = -421/47

x = -421/47 : 2

x = -421/94

b) 70 - 5(x - 3) = 45

5(x - 3) = 70 - 45

5(x - 3) = 25

x - 3 = 25 : 5

x - 3 = 5

x = 5 + 3

x = 8

c) 4 + 95 : x = 143 : 142 - 23

4 + 95 : x = -3123/142

95 : x = -3123/142 - 4

95 : x = -3691/142

x = 95 : (-3691/142)

x = -13490/3691

(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

a) ( x - 7 ) . ( 2x - 8 ) = 0 

TH1 : ( x -7 ) = 0 

=>       x      = 0 + 7 

=>       x      = 7 

TH2 : ( 2x -8)=0

=>      2x      = 0 + 8 
=>      2x      = 8 

=>        x      = 8 : 2 

=>        x      = 4 

Vậy...

11x19=209

11.19=209

11 x 19 = 209 

 a)12 x 11 + 21 x 11 x 11 + 11 x 33

= ( 12 x 11 ) + ( 21 x 11 x 11 ) + ( 11 x 33 )

= 

= 

b)132x11-11x32-54x11

= ( 132 x 11 ) - ( 11 x 32 ) - ( 54 x 11 )

= 

\(a,=11\times\left(12+21+33\right)=11\times66=726\\ b,=11\times\left(132-32-54\right)=11\times46=506\\ c,=11\times\left(245+365\right)=11\times610=6710\\ d,=75\times\left(78+89+123\right)=75\times290=21750\\ e,=\left(2\times50\right)\times\left(250\times8\right)=100\times2000=200000\\ g,=1994\times\left(867+11\right)=1994\times878=1750732\)

a) 12 x 11 + 21 x 11 + 11 x 33

= 11 x ( 12 + 21 + 33)

= 11 x 66

= 726

b) 132 x 11 - 11 x 32 - 54 x 11

= 11 x ( 132 - 32 - 54)

= 11 x 46

= 506

c) 245 x 11 + 11 x 365

= 11 x ( 245 + 365 )

= 11 x 610 = 6710

d) 78 x 75 + 75 x 89 + 75 x 123

= 75 x ( 78 + 89 + 123)

= 75 x 290 = 21750

e) 2 x 250 x 50 x 8

= (2 x 50) x ( 250 x 8)

= 100 x 2000 = 200000

g) 1994 x 867 + 1994 x 11

= 1994 x ( 867 + 11)

= 1994 x 878 = 1750732