=> (x - 3) - 8 = 12 : 4
=> (x - 3) - 8 = 3
=> x - 3 = 8 + 3 
=> x - 3 = 11
=> x = 11 + 3 
=> x = 14

12 : (x - 3) - 8 = 4

12 : ( x - 3 ) = 4 + 8

12 : ( x - 3 ) = 12

x - 3 = 12 : 12

x - 3 = 1

x = 1 + 3

x = 4

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>

`4/15 < 4/13`

`7/6 > 8/9`

`14/11 > 14/19`

`5/6 >3/4`

<;>;>;>

\(\dfrac{3^8\cdot20^5-3^9\cdot5^5\cdot2^9}{6^8\cdot10^4-3^8\cdot2^9\cdot5^4}=\dfrac{3^8\cdot2^{10}\cdot5^5-3^9\cdot5^5\cdot2^9}{2^8\cdot3^8\cdot2^4\cdot5^4-3^8\cdot2^9\cdot5^4}\\ =\dfrac{3^8\cdot2^9\cdot5^5\left(2-3\right)}{2^9\cdot3^8\cdot5^4\left(2^3-1\right)}=\dfrac{-5}{2^3-1}=\dfrac{-5}{7}\)

\(\dfrac{4}{5}=\dfrac{12}{15}\\ \dfrac{15}{21}=\dfrac{5}{7}\\ \dfrac{3}{8}=\dfrac{12}{32}\\ \dfrac{36}{24}=\dfrac{6}{4}\)

4/5 = 12/15

15/21 = 5/7

3/8 =12/32

36/24 =6/4

4/5 = 12/15

15/21 = 5/7

3/8 =12/32

36/24 =6/4

a: =2/5-3/5+3/7=3/7-1/5

=15/35-7/35

=8/35

b: =>5/7:x=4/3

=>x=5/7:4/3=5/7*3/4=15/28

c: =>x-1/3=15/8:4/5=15/8*5/4=75/32

=>x=75/32+1/3=257/96

d: =>2x+1/8=2/7

=>2x=9/56

=>x=9/112

e: =>2x=10/3-5/4-3/4=10/3-2=4/3

=>x=2/3

\(a,\dfrac{2}{5}+\dfrac{3}{7}+\left(-\dfrac{3}{5}\right)\\ =\dfrac{2}{5}+\dfrac{3}{7}-\dfrac{3}{5}\\=\left(\dfrac{2}{5}-\dfrac{3}{5}\right)+\dfrac{3}{7}\\ =-\dfrac{1}{5}+\dfrac{3}{7}\\ =-\dfrac{7}{35}+\dfrac{15}{35}\\ =\dfrac{8}{35}\\ b,1-\dfrac{5}{7}:x=-\dfrac{1}{3}\\ =>\dfrac{5}{7}:x=1-\left(-\dfrac{1}{3}\right)\\ =>\dfrac{5}{7}:x=1+\dfrac{1}{3}\\ =>\dfrac{5}{7}:x=\dfrac{3}{3}+\dfrac{1}{3}\\ =>\dfrac{5}{7}:x=\dfrac{4}{3}\\ =>x=\dfrac{5}{7}:\dfrac{4}{3}\\ =>x=\dfrac{5}{7}.\dfrac{3}{4}\\ =>x=\dfrac{15}{28}\\ c,\dfrac{4}{5}\left(x-\dfrac{1}{3}\right)=\dfrac{15}{8}\\ =>x-\dfrac{1}{3}=\dfrac{15}{8}:\dfrac{4}{5}\\ =>x-\dfrac{1}{3}=\dfrac{15}{8}.\dfrac{5}{4}\\ =>x-\dfrac{1}{3}=\dfrac{75}{32}\\ =>x=\dfrac{75}{32}+\dfrac{1}{3}\\ =>x=\dfrac{257}{96}\)

\(d,\dfrac{2}{3}:\left(2x+\dfrac{1}{8}\right)=\dfrac{7}{3}\\ =>2x+\dfrac{1}{8}=\dfrac{2}{3}:\dfrac{7}{3}\\ =>2x+\dfrac{1}{8}=\dfrac{2}{3}.\dfrac{3}{7}\\ =>2x+\dfrac{1}{8}=\dfrac{2}{7}\\ =>2x=\dfrac{2}{7}-\dfrac{1}{8}\\ =>2x=\dfrac{16}{56}-\dfrac{7}{56}\\ =>2x=\dfrac{9}{56}\\ =>x=\dfrac{9}{56}:2\\ =>x=\dfrac{9}{112}\\ e,2x+\dfrac{3}{4}=\dfrac{10}{3}-\dfrac{5}{4}\\ =>e,2x+\dfrac{3}{4}=\dfrac{40}{12}-\dfrac{15}{12}\\ =>2x+\dfrac{3}{4}=\dfrac{25}{12}\\ =>2x=\dfrac{25}{12}-\dfrac{3}{4}\\ =>2x=\dfrac{25}{12}-\dfrac{9}{12}\\ =>2x=\dfrac{16}{12}\\ =>2x=\dfrac{4}{3}\\ =>x=\dfrac{4}{3}:2\\ =>x=\dfrac{4}{6}\\ =>x=\dfrac{2}{3}\)

a)2/5+3/4

=23/20

b)2/5 + 3/10-1/2

=7/10-1/2

=1/5

c)8/11+8/33x3/4

=8/11 + 2/11

=10/11

tick cho mik nha mik cháy  đen túi r

hok tốt

tham khảo 

Vì a chia cho 8 dư 6⇒(a+2)⋮8

a chia cho 12 dư 10 ⇒(a+2)⋮12

Do đó (a+2)∈BC(12;8) mà BCNN(12,8)=24.

Do đó (a+2)⋮24⇒a chia cho 24 dư 22

nó tương tự á

a: =20,23(15,75+85,25-1)

=20,23*100

=2023

b: =4+4=8

c: =6,48(111-1-10)=648

d: =1,25*8*0,25*4

=10

a. 20,23 x 15,75 + 20,23 x 85,25 - 20,23

 = 20,23 . (15,75 + 85,25 - 1)

= 20,23 . 100

= 2023

b.0,66 + 1,2+ 3,34+2,8 

= 4+4

= 8

c.111 x 6,48 -6,48 - 6,48 x 10

 = 6,48 . (111 - 1 -10)

= 648

d.1,25 x 0,25 x 8 x 4

 = 1,25 . 8 . 0,25 . 4

= 10

10 giờ 30 phút

5 năm 4 tháng

27 phút 48 giây

4 phút 24 giây

4 giờ 53 phút + 5 giờ 37 phút = 10 giờ 30 phút

2 năm 8 tháng x 2 = 5 năm 4 tháng

54 phút 25 giây - 26 phút 37 giây = 27 phút 48 giây

17 phút 36 giây : 4 = 4 phút 24 giây