\(a,\dfrac{6}{11}+6+\dfrac{5}{7}=\dfrac{42+462+55}{77}=\dfrac{559}{77}\)

\(b,\dfrac{9}{8}\times\dfrac{3}{12}:\dfrac{5}{9}=\dfrac{9}{8}\times\dfrac{3}{12}\times\dfrac{9}{5}=\dfrac{243}{480}=\dfrac{81}{160}\)

\(c,\dfrac{8}{7}:4+2=\dfrac{8}{7}\times\dfrac{1}{4}+2=\dfrac{8}{28}+2=\dfrac{2}{7}+2=\dfrac{16}{7}\)

\(d,\dfrac{3}{5}+4:\dfrac{6}{4}=\dfrac{3}{5}+4\times\dfrac{4}{6}=\dfrac{3}{5}+\dfrac{8}{3}=\dfrac{49}{15}\)

\(a,\dfrac{6}{11}+6+\dfrac{5}{7}=\dfrac{6}{11}+\dfrac{66}{11}+\dfrac{5}{7}=\dfrac{72}{11}+\dfrac{5}{7}=\dfrac{504}{77}+\dfrac{55}{77}=\dfrac{559}{77}\)

\(b,\dfrac{9}{8}\times\dfrac{3}{12}:\dfrac{5}{9}=\dfrac{9}{32}:\dfrac{5}{9}=\dfrac{9}{32}\times\dfrac{9}{5}=\dfrac{81}{160}\)

\(c,\dfrac{8}{7}:4+2=\dfrac{8}{7}\times\dfrac{1}{4}+2=\dfrac{2}{7}+2=\dfrac{2}{7}+\dfrac{14}{7}=\dfrac{16}{7}\)

\(d,\dfrac{3}{5}+4:\dfrac{6}{4}=\dfrac{3}{5}+4\times\dfrac{4}{6}=\dfrac{3}{5}+\dfrac{8}{3}=\dfrac{9}{15}+\dfrac{40}{15}=\dfrac{49}{15}\)

25/7 - 2 + 3/2 = 43/14

4/5 x 10/3 : 8= 4/5 x 10/3 x 1/8 = 1/3

7/3 + 2/5 : 1/6 = 7/3+ 2/5 x 6 = 7/3 + 12/5 = 71/15

25/7 - 2 + 3/2 = 43/14

25/7 - 2 + 3/2 = 43/14

4/5 x 10/3 : 8 = 1/3

7/3 + 2/5 : 1/6 = 71/15

\(a,6:\dfrac{5}{2}-\dfrac{3}{10}=6\times\dfrac{2}{5}-\dfrac{3}{10}=\dfrac{12}{5}-\dfrac{3}{10}=\dfrac{120}{50}-\dfrac{15}{50}=\dfrac{105}{50}=\dfrac{21}{10}\)

\(b,\dfrac{4}{6}:\dfrac{4}{3}+5:\dfrac{4}{3}=\left(\dfrac{4}{6}+5\right):\dfrac{4}{3}=\left(\dfrac{4}{6}+\dfrac{30}{6}\right):\dfrac{4}{3}=\dfrac{34}{6}\times\dfrac{3}{4}=\dfrac{102}{24}=\dfrac{17}{4}\)

éc ô ét giúp mình vớiiiiiii! HUHU=((

\(\dfrac{4}{5}\)+\(\dfrac{-5}{4}\)=\(\dfrac{0}{4}\)

\(\dfrac{-1}{3}\)+\(\dfrac{2}{5}-\dfrac{5}{6}\)=\(\dfrac{-10}{30}+\dfrac{12}{30}-\dfrac{25}{30}\)=\(\dfrac{-23}{30}\)

\(\dfrac{2}{3}-\dfrac{5}{7}.\dfrac{14}{25}\)=\(\dfrac{2}{3}-\dfrac{2}{5}\)=\(\dfrac{10}{15}-\dfrac{6}{15}\)=\(\dfrac{4}{15}\)

a: \(=\dfrac{16-25}{20}=\dfrac{-9}{20}\)

b: \(=\dfrac{-10}{30}+\dfrac{12}{30}-\dfrac{25}{30}=-\dfrac{23}{30}\)

c: \(=\dfrac{2}{3}-\dfrac{1}{5}\cdot2=\dfrac{2}{3}-\dfrac{2}{5}=\dfrac{10-6}{15}=\dfrac{4}{15}\)

d: \(=\dfrac{12-25}{30}\cdot\dfrac{15}{8}-1=\dfrac{-13}{16}-1=\dfrac{-29}{16}\)

e: \(=\dfrac{-3}{13}-\dfrac{10}{13}-\dfrac{7}{17}+\dfrac{24}{17}-\dfrac{5}{19}-\dfrac{14}{19}=-1\)

a: \(7^{x-5}+121=58\cdot2^3\)

=>\(7^{x-5}+121=58\cdot8\)

=>\(7^{x-5}=343\)

=>x-5=3

=>x=8

b: \(10^{x+25}+168=73\cdot2^4\)

=>\(10^{x+25}+168=73\cdot16\)

=>\(10^{x+25}=1000\)

=>x+25=3

=>x=-22

c: \(5x+59=21\cdot2^2=21\cdot4=84\)

=>5x=84-59=25

=>x=5

d: \(3+2^{x-1}=24-\left[4^2-\left(2^2-1\right)\right]\)

=>\(2^{x-1}+3=24-16+3\)

=>\(2^{x-1}=8\)

=>x-1=3

=>x=4

7ˣ⁻⁵ + 121 = 58.2³

7ˣ⁻⁵ = 58.8 - 121

7ˣ⁻⁵ = 464 - 121

7ˣ⁻⁵ = 343

7ˣ⁻⁵ = 7³

x - 5 = 3

x = 3 + 5

x = 8

-------

10ˣ⁻²⁵ + 168 = 73.2⁴

10ˣ⁻²⁵ = 73.16 - 168

10ˣ⁻²⁵ = 1000

10ˣ⁻²⁵ = 10³

x - 25 = 3

x = 3 + 25

x = 28

-------- 

5x + 59 = 21.2²

5x = 21.4 - 59

5x = 84 - 59

5x = 25

x = 25 : 5

x = 5

--------

3 + 2ˣ⁻¹ = 24 - [4² - (2² - 1)]

3 + 2ˣ⁻¹ = 24 - (16 - 3)

2ˣ⁻¹ = 24 - 13 - 3

2ˣ⁻¹ = 8

2ˣ⁻¹ = 2³

2ˣ⁻¹ = 3

x - 1 = 3

x = 3 + 1

x = 4

a) 2/3 : 3/5 × 5/7 : 2/3

= 2/3 × 5/3 × 5/7 × 3/2 

= 25/21

b) 1 1/2 × 1 1/3 × 1 1/18 × 1 1/15 × 1 1/24 × 1 1/35

= 3/2 × 4/3 × 19/18 × 16/15 × 25/24 × 36/35

= 2 × 152/35 × 15/14

= 304/35 × 15/14

= 152/7

1x2x3x4x5x6x7x8x9

2x3x4x5x6x7x8x9x10

=1/10

b)1/2*2/3*3/4*4/5*5/6*6/7*7/8*8/9*9/10

=1x2x3x4x5x6x7x8x9

  2x3x4x5x6x7x8x9x10

= 1

  10