\(\left\{\left[3^{14}.69+3^{14}.12\right]:3^{16}-7\right\}:2^4\\ =\left[3^{14}\left(69+12\right):3^{16}-7\right]:2^4=\left[\left(3^{14}.3^4\right):3^{16}-7\right]:2^4\\ =\left(3^2-7\right):2^4=\left(9-7\right):2^4=2:2^4=\dfrac{1}{8}\)

Bạn ơi! Bạn viết sai dấu ngoặc nhé! Mình sửa thành:

[(3¹⁴. 69 + 3¹⁴. 12) : 3¹⁶ - 7] : 2⁴

= {[ 3¹⁴. (69 + 12)] : 3¹⁶ - 7} : 2⁴

= {[ 3¹⁴. 81] : 3¹⁶ - 7} : 2⁴

= {[3¹⁴. 3⁴] : 3¹⁶ - 7} : 2⁴

= {3¹⁸ : 3¹⁶ - 7} : 2⁴

= {3² - 7} : 2⁴

= {9 - 7} : 2⁴

= 2 : 16

= \(\dfrac{1}{8}\)

= 8.

\(\left\{\left[3^{14}.69+12.3^{14}\right]:3^{16}-7\right\}:2^4\)

\(=\left\{\left[3^{14}.\left(69+12\right)\right]:3^{16}-7\right\}:16\)

\(=\left\{\left[3^{14}.81\right]:3^{16}-7\right\}:16\)

\(=\left\{\left[3^{14}.3^4\right]:3^{16}-7\right\}:16\)

\(=\left\{3^{18}:3^{16}-7\right\}:16\)

\(=\left\{3^2-7\right\}:16\)

\(=\left\{9-7\right\}:16\)

\(=2:16\)

\(=\frac{1}{8}\)

1 , 10

2 , 8

3 , 5

4 , 2

5 , 1

6 ,

1/ `|x|=10<=> x=\pm 10`

2/ `|x-8|=0<=>x-8=0<=>x=8`

3/ `7+|x|=12<=>|x|=5<=>x=\pm 5`

4/ `|x+1|=3`

$\Leftrightarrow\left[\begin{array}{1}x+1=3\\x+1=-3\end{array}\right.\\\Leftrightarrow\left[\begin{array}{1}x=3\\x=-4\end{array}\right.$

5/ `15-x=16-(14-42)`

`<=>15-x=16+28`

`<=>15-x=44`

`<=>x=-29`

6/ `210-(x-12)=168`

`<=>210-x+12=168`

`<=>222-x=168`

`<=>x=54`

1.

\(\left|x\right|=10\Leftrightarrow x=\pm10\)

2.

\(\left|x-8\right|=0\Leftrightarrow x-8=0\Leftrightarrow x=8\)

3.

\(7+\left|x\right|=12\Leftrightarrow\left|x\right|=5\Leftrightarrow x=\pm5\)

Bài 1: 

1: =-5/24+16/27+3/4

=-5/24+18/24+16/27

=13/24+16/27

=117/216+128/216=245/216

2: =-1/3+1/3+6/7=6/7

3: \(=\dfrac{1}{2}-\dfrac{7}{12}+\dfrac{1}{2}=1-\dfrac{7}{12}=\dfrac{5}{12}\)

4: \(=-\dfrac{5}{8}+\dfrac{14}{25}-\dfrac{6}{10}=\dfrac{-125+112-120}{200}=\dfrac{-133}{200}\)

2 x 18 x 14 + 3 x 17 x 12 + 4 x 69 x 9

=(2 x 18) x 14 + (3 x 12) x 17 + (4 x 9) x 69

=36 x 4 + 36 x 17 + 36 x 69

= 36x( 4+17+69)

=36x100

=3600

Chúc bạn học tốt ^_^

2 x 18 x 14 + 3 x 17 x 12 + 4 x 69 x 9

=(2 x 18) x 14 + (3 x 12) x 17 + (4 x 9) x 69

=36 x 4 + 36 x 17 + 36 x 69

= 36x( 4+17+69)

=36x100+

=3600

\(2.18.14+3.17.12+4.69.9\)

\(=\left(2.18\right).14+\left(3.12\right).17+\left(4.9\right).69\)

\(=36.4+36.17+36.69\)

\(=36.\left(4+17+69\right)\)

\(=36.100\)

\(=3600\)

~ Rất vui vì giúp đc bn ~

1.\(\dfrac{8}{11}+\dfrac{8}{33}\times\dfrac{3}{4}=\dfrac{8}{11}+\dfrac{8\times3}{33\times4}=\dfrac{8\times12}{11\times12}+\dfrac{8\times3}{33\times4}=\dfrac{8\times15}{132}=\dfrac{120}{132}=\dfrac{10}{11}\)

2.\(\dfrac{7}{9}\times\dfrac{3}{14}:\dfrac{5}{8}=\dfrac{7}{9}\times\dfrac{3}{14}\times\dfrac{8}{5}=\dfrac{4}{15}\)

3.\(\dfrac{5}{12}-\dfrac{7}{32}:\dfrac{21}{16}=\dfrac{5}{12}-\dfrac{7}{32}\times\dfrac{16}{21}=\dfrac{5}{12}-\dfrac{1}{6}=\dfrac{5-2}{12}=\dfrac{3}{12}=\dfrac{1}{4}\)

`@V.Tr.V`

`8/11+8/33xx3/4=8/11+2/11=10/11`

`7/9xx3/14:5/8=7/9xx3/14xx8/5=[7xx3xx4xx2]/[3xx3xx7xx2xx5]=4/[3xx5]=4/15`

`5/12-7/32:21/16=5/12-7/32xx16/21=5/12-2/12=3/12=1/4`

8/11 + 8/33 x 3/4 = 8/11 + 2/11 = 10/11

7/9 x 3/14 : 5/8 = 1/6 : 5/8 = 4/15

5/12 - 7/32 : 21/16 = 5/12 - 1/6 = 1/4

2 x 18 x 14 + 3 x 17 x 12 + 4 x 69 x 6

= (2 x 18) x 14 + (3 x 12) x 17 + (4 x 6) x 69

= 36 x (14 + 17 + 69)

= 36 x 100

= 3600

\(2.18.14+3.17.12+4.69.6\)

\(=\left(2.18\right).14+\left(3.12\right).17+\left(4.6\right).69\)

\(=36.14+36.17+24.69\)

\(=36.\left(14+17\right)+24.69\)

\(=36.31+24.69\)

\(=4.9.31+4.6.69\)

\(=4.\left(9.31+6.69\right)\)

\(=4.\left(279+414\right)\)

\(=4.693\)

\(=2772\)

Jennie Kim làm sai từ dòng thứ 3 rồi nha bn

~ Rất vui vì giúp đc bn ~

BÀI 1: Tính

1) -(-10)-(+14)=10-14=-4

2) -(+15)-12=-15-12=-27

3) (-11)-(-13)=-11+13=2

4) -(-13)-(-10)=13+10=23

5) -4-(+7)=-4-7=-11

Bài 2 : tìm x:

a)x+(-5)=-(-7) 

           x=7+(-5)

           x=2

vậy x=2

b)x-8=-(+10)

x-8=10

   x=10+8

  x=18

vậy x=18

c)x-(-12)=14

x+12=14

      x=14-12

      x=2

vậy x=2

d)x-(+3)=-17

x-3=17

   x=17+3

   x=20

vậy x=20

e)x+20=-(-23)

x+20=23

      x=23-20

      x=3

vậy x=3

BÀI 3:tính

a)17-(-9)-(+25)

=17+9-25

=26-25

=1

b)-[-13]-15+(-20)

=13-15-20

=-2-20

=-22

c)-17-(-16)-23

=-17+16-23

=-1-23

=-24

d)-(-25)-(-14)+(-17)

=25+14-17

=39-17

=22

cảm ơn bạn rất nhiều chúc bạn và gia đình mạnh khỏe, vui vẻ bên nhau và cùng đón 1 cái TẾT vui vẻ!

HAPPY NEW YEAR

haha ối giời ơi

BT1 :thực hành phép tính

4/3+-11/31+3/10-20/31-2/5 = 7/30

7/12-1/-16+3/4 = 67/48

2/11.-5/4+-9/11.5/4+ 1 và 3/4 = -1/4 * và 3/4 là sao bạn *

-9/27-25/75 = -2/3