\(\dfrac{\dfrac{22}{15}}{11-x}\) + \(\dfrac{2}{3}\) = \(\dfrac{7}{5}\)

\(\dfrac{\dfrac{22}{15}}{11-x}\) = \(\dfrac{7}{5}\) - \(\dfrac{2}{3}\)

\(\dfrac{\dfrac{22}{15}}{11-x}\) = \(\dfrac{11}{15}\) 

11 - \(x\) = \(\dfrac{22}{15}\) : \(\dfrac{11}{15}\)

11 - \(x\) = 2

        \(x\) = 11 - 2

         \(x\) = 9

\(\frac{15}{8}\)+\(\frac{7}{12}\)-\(\frac{13}{3}\)x\(\frac{3}{8}\)

=\(\frac{45}{24}\)+\(\frac{14}{24}\)-\(\frac{13}{8}\)

=\(\frac{59}{24}\)-\(\frac{39}{24}\)

=\(\frac{20}{24}\)=\(\frac{5}{6}\)

\(\frac{11}{5}\)+\(\frac{5}{22}\):2+\(\frac{5}{6}\)

=\(\frac{11}{5}\)+\(\frac{5}{44}\)+\(\frac{5}{6}\)

=\(\frac{484}{220}\)+\(\frac{25}{220}\)+\(\frac{5}{6}\)

=\(\frac{509}{220}\)+\(\frac{5}{6}\)

=\(\frac{1527}{660}\)+\(\frac{550}{660}\)

=\(\frac{2077}{660}\)

5/8x16/7x21/25

=1/1x2/1x3/5

=6/5

11/12:22/30x6/15

=11/12x30/22x6/15

=1/2x1/2x1/2

=1/8

5/8x16/7x21/25

=1/1x2/1x3/5

=6/5

11/12:22/30x6/15

=11/12x30/22x6/15

=1/2x1/2x1/2

=1/8

Ghi lời giải giúp mình☺☺☺☺☺

Minh bao cao roi /!\

A )  2/17 + 30/46 + 15/17 + 4/49 + 8/23=102/49

B ) 5/8 x ( 19/31 x 8/5 )=19/31

C ) 7/9 x 8/15 x 9/7 x 15/4=2

D ) 11/12 x 24/7 x 21/22=3

nhìu quá nên mk chỉ cho kết quả thôi nha ^-^!!!

\(a)x+\frac{2}{3}=\frac{5}{6}\)

\(x=\frac{5}{6}-\frac{2}{3}\)

\(x=\frac{5}{6}-\frac{4}{6}=\frac{1}{6}\)

\(b)x-\frac{3}{5}=\frac{2}{7}+\frac{1}{5}\)

\(x=\frac{3}{5}-\frac{17}{35}\)

\(x=\frac{21}{35}-\frac{17}{35}\)

\(x=\frac{4}{35}\)

\(c)x\div\frac{9}{11}=\frac{5}{22}\)

\(x=\frac{5}{22}\times\frac{9}{11}\)

\(x=\frac{45}{242}\)

\(d)\frac{3}{5}\times x=\frac{3}{10}\)

\(x=\frac{3}{10}\div\frac{3}{5}\)

\(x=\frac{1}{2}\)

\(a)\)\(x+\frac{2}{3}=\frac{5}{6}\)

\(x=\frac{5}{6}-\frac{2}{3}\)

\(x=\frac{1}{6}\)

\(b)\)\(x-\frac{3}{5}=\frac{2}{7}+\frac{1}{5}\)

\(x-\frac{3}{5}=\frac{17}{35}\)

\(x=\frac{17}{35}+\frac{3}{5}\)

\(x=\frac{38}{35}\)

a)\(\frac{27}{5}\text{x}\frac{91}{12}\text{x}\frac{125}{9}\text{x}\frac{96}{13}=\frac{27}{9}\text{x}\frac{91}{13}\text{x}\frac{125}{5}\text{x}\frac{96}{12}=3\text{x}7\text{x}25\text{x}8\)

Đến đây tự tính nha !

b)\(\frac{2539}{35}\text{x}\frac{7}{90}+\frac{561}{35}\text{x}\frac{7}{90}=\frac{7}{90}\text{x}\left(\frac{2539}{35}+\frac{561}{35}\right)=\frac{7}{90}\text{x}\frac{3100}{35}=\frac{3100}{90}\text{x}\frac{7}{35}=\frac{310}{9}\text{x}\frac{1}{5}=\frac{62}{9}\)

1. 27/5 x 91/12 x 125/9 x 96/13

2. 2539/35 x 7/90 + 561/35 x 7/90

3. 31/7 : (2/5 x 31/7)

4. (29 x 15/23 x 36/29) : 5/23

phan AVIET DAY so them mot it di

Ta có:

A = 1 + 3 + 5 + 7 +... + 101

A = \(\frac{102.51}{2}=2601\)

M = 16 - 18 + 20 - 22 + 24 - 26 + .. + 64 - 66 + 68

M = ( 16 - 18 ) + ( 20 - 22 ) + ( 24 - 26 ) + ... + ( 64 - 66 ) + 68

M = (- 2 + - 2 + -2  + ... + - 2 ) + 68

M = 25/2 . ( - 2 ) + 68

M = -25 + 68

M = 43

H = ( 1 + 2 + 3 +...+ 99 ) x ( 13 x 15 - 12 x 15 - 15 )

H = ( 1 + 2 + 3 +...+ 99 ) x { (13 - 12 - 1) x 15 }

H = ( 1 + 2 + 3 +...+ 99 ) x 0

H = 0

G = 1 + 2 - 3 - 4 + 5 + 6 - 7 - 8 + 9 + 10 - 11 - 12 + 13 + 14 - ... + 301 + 302

G = ( 1 + 2 ) + ( -3 - 4 ) + ( 5 + 6 ) + ( -7 - 8 ) + ( 9 + 10 ) + ( - 11 - 12 ) + ( 13 + 14 ) -...+ ( 301 + 302 )

G = ( 3 - 7 ) + ( 11 - 15 ) + ( 19 - 23 ) + 27 - ... + 603

G = -4 + - 4 + -4 + 27 - ... + 603

G = 75 x ( -4 ) + 603

G = -300 + 603

G = 303

2.

a) 1 + 2 + 3 + 4 +...+ 99 + 100 + 2 x X = 5052

= > \(\frac{100.101}{2}\)+ 2 x X = 5052

= > 5050 + 2 x X = 5052

= > 2X = 2

= > X = 1