\(\dfrac{1}{7}\cdot\dfrac{5}{9}+\dfrac{5}{9}\cdot\dfrac{2}{7}+\dfrac{5}{9}\cdot\dfrac{1}{7}+\dfrac{5}{9}\cdot\dfrac{3}{7}\)

=5/9(1/7+2/7+1/7+3/7)

=5/9*1

=5/9

\(9\over 100\)

\(5 \over 32\)

\(9\frac{1}{10}\)

\(5\frac{3}{2}\)

có phải đề là:

\(\frac{1}{2}\)+\(\frac{2}{3}\)+\(\frac{3}{4}\)+\(\frac{4}{5}\)+\(\frac{3.99}{100}\)không bạn

I Love you mik nghĩ bn nên đọc kĩ đề hơn .Cộng 3 chấm là cộng ... mà chứ k phải 3.99

ừm hứm

` 5/9 . ( -2/13)+5/9.(-7/13)+(-8/13) = 5/9(-2/13-7/13)-8/13=5/9.(-9/13)-8/13=-5/13-8/13=-13/13=-1 `

GHI ra phân số đc ko

=100/273 hả đk ???🤔🤔😵😵

cái cuối chưa có dấu = nha sorry

\(\frac{7}{8}-\frac{1}{3}=\frac{21}{24}-\frac{8}{24}=\frac{13}{24}\)

\(\frac{8}{9}+\frac{2}{5}=\frac{40}{45}+\frac{18}{45}=\frac{58}{45}\)

\(\frac{3}{10}\times\frac{1}{6}=\frac{3\times1}{10\times6}=\frac{3}{60}=\frac{1}{20}\)

\(\frac{8}{9}:\frac{3}{7}=\frac{8}{9}\times\frac{7}{3}=\frac{8\times7}{9\times3}=\frac{56}{27}\)

7/8 - 1/3 = 13/24

8/9 + 2/5 = 58/45

3/10 x 1/6 = 3/60

8/9 : 3/7 = 56/27

#vanh#

a/ 3/5 * 8/27 * 5/3

=3*8*5/5*27*3

=8/27(rút gọn)

b/ 7/19 * 1/3 +7/19 * 2/3

=7/19 * (1/3 + 2/3)

=7/19 * 1

=7/19

giúp mik

3/5x8/27x5/3=8/27x3/5x5/3=8/27x1=8/27

7/19x1/3+7/19x2/3=7/19x(1/3+2/3)=7/19x1=7/19