\(\frac{25}{32}\cdot\frac{8}{50}.\frac{4}{3}.\frac{5}{10}=\frac{1}{12}\)

\(\frac{25}{32}\times\frac{8}{50}\times\frac{4}{3}\times\frac{5}{10}\)

\(=\frac{5\times5\times8\times4\times5}{8\times4\times5\times5\times2\times3\times5\times2}\)

\(=\frac{1}{12}\)

k mk nha

thank you very much

GIẢI

Tính : 

8/2 + 5/2 = 13/2   

5/10 + 5/10 = 10/10 = 1

4/10 + 5/10 = 9/10

6/7 + 1/7 = 7/7 = 1

HỌC TỐT

            Giải

8/2 + 5/2 = 13/2                                               5/10 + 5/10 = 10/10 = 1 

4/10 + 5/10 = 9/10                                           6/7 + 1/7 = 7/7 = 1

6/5 > 5/6

8/9 > 21/81

9/63 < 90/7

8/81 < 10/9

Tk mk nha

so sánh với 1

rút gọn hoặc quy đồng số còn lại để so sánh tử

so sánh với 1

cũng so sánh với 1

bạn đùa hay hỏi thật vậy

Bài làm

+ \(\frac{2}{5}+\frac{7}{10}=\frac{4}{10}+\frac{7}{10}=\frac{11}{10}\)

+\(\frac{6}{7}-\frac{5}{8}=\frac{48}{56}-\frac{35}{56}=\frac{13}{56}\)

# Học tốt #

Bài 1 : Tính

\(\frac{2}{5}+\frac{7}{10}=\frac{4}{10}+\frac{7}{10}=\frac{11}{10}\)

\(\frac{6}{7}-\frac{5}{8}=\frac{48}{56}-\frac{35}{56}=\frac{13}{56}\)

~ Thiên Mã ~

\(\frac{1}{2}:\frac{3}{2}:\frac{5}{4}:\frac{6}{5}:\frac{7}{6}:\frac{8}{7}\)

\(=\frac{1}{2}\cdot\frac{2}{3}\cdot\frac{4}{5}\cdot\frac{5}{6}\cdot\frac{6}{7}\cdot\frac{7}{8}\)

\(=\frac{1\cdot\left(2\cdot5\cdot6\cdot7\right)}{8\cdot3\cdot\left(2\cdot5\cdot6\cdot7\right)}\)

\(=\frac{1}{24}\)

\(\frac{1}{2}\cdot\frac{2}{3}\cdot\frac{3}{4}\cdot\frac{4}{5}\cdot\frac{5}{6}\cdot\frac{6}{7}\cdot\frac{7}{8}\cdot\frac{8}{9}\cdot\frac{9}{10}\)

\(=\frac{1\cdot\left(2\cdot3\cdot4\cdot5\cdot6\cdot7\cdot8\cdot9\right)}{\left(2\cdot3\cdot4\cdot5\cdot6\cdot7\cdot8\cdot9\right)\cdot10}\)

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

\(\frac{2}{5}=\frac{4}{10}\)

\(\frac{12}{30}=\frac{4}{10}\)

\(\frac{72}{45}=\frac{8}{5}\)

\(\frac{1}{4}=\frac{7}{28}\)

2/5=4/10

12/30=4/10

72/45=8/5

1/4=7/28

\(\frac{7}{8}\)x \(\frac{8}{9}\)x \(\frac{9}{10}\)

= \(\frac{7}{9}\)x  \(\frac{9}{10}\)

= \(\frac{7}{10}\)

1 x \(\frac{2}{3}\): \(\frac{4}{3}\) : \(\frac{5}{4}\)

= \(\frac{2}{3}\)x \(\frac{3}{4}\)x \(\frac{4}{5}\)

= \(\frac{1}{2}\) x \(\frac{4}{5}\)

= \(\frac{2}{5}\)

\(\frac{7}{8}\times\frac{8}{9}\times\frac{9}{10}\)

\(=\frac{7\times8\times9}{8\times9\times10}\)

\(=\frac{7}{10}\)

\(1\times\frac{2}{3}:\frac{4}{3}:\frac{5}{4}\)

\(=\frac{2}{3}\times\frac{3}{4}\times\frac{4}{5}\)

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

a)\(\dfrac{5}{7}+\dfrac{4}{9}=\dfrac{45}{63}+\dfrac{28}{63}=\dfrac{73}{63}\) ; \(\dfrac{9}{11}+\dfrac{3}{8}=\dfrac{72}{88}+\dfrac{33}{88}=\dfrac{105}{88}\)

\(\dfrac{4}{5}-\dfrac{2}{3}=\dfrac{12}{15}-\dfrac{10}{15}=\dfrac{2}{15}\); \(\dfrac{16}{25}-\dfrac{2}{5}=\dfrac{16}{25}-\dfrac{10}{25}=\dfrac{6}{25}\)

b)\(5+\dfrac{3}{5}=\dfrac{25}{5}+\dfrac{3}{5}=\dfrac{28}{5};10-\dfrac{9}{16}=\dfrac{160}{16}-\dfrac{9}{16}=\dfrac{151}{16}\)

\(\dfrac{2}{3}-\left(\dfrac{1}{6}+\dfrac{1}{8}\right)=\dfrac{2}{3}-\left(\dfrac{8}{48}+\dfrac{6}{48}\right)=\dfrac{2}{3}-\dfrac{14}{48}=\dfrac{32}{48}-\dfrac{14}{48}=\dfrac{3}{8}\)

d : \(\frac{8}{9}=\frac{8}{10}\)

d       \(=\frac{8}{10}\)x  \(\frac{8}{9}\)

d         \(=\frac{32}{45}\)

ta có :

\(\frac{3}{7}=\frac{18}{42}\)

\(\frac{5}{6}=\frac{35}{42}\)

vì \(\frac{18}{42}< \frac{35}{42}\)

=> \(\frac{3}{7}< \frac{5}{6}\)

Ta có :

\(\frac{1}{5}:2\)= \(\frac{1}{5}\)x  \(\frac{1}{2}\)= \(\frac{1}{10}\)

\(d:\frac{8}{9}=\frac{8}{10}\)

        \(d=\frac{8}{10}-\frac{8}{9}\)

      \(d=-\frac{4}{45}\)

\(\frac{3}{7}< \frac{5}{6}\)

\(\frac{1}{5}:2=\frac{1}{10}\)

\(nha^{ }\)

a)=7/8

b)=2/3

c)=11/24

\(a,\frac{4}{5}\times\frac{a}{b}=\frac{7}{10}\)

               \(\frac{a}{b}=\frac{7}{10}:\frac{4}{5}\)

               \(\frac{a}{b}=\frac{7}{10}\times\frac{5}{4}\)

                \(\frac{a}{b}=\frac{7}{8}\)

\(b,\frac{1}{3}:\frac{a}{b}=\frac{2}{3}:\frac{4}{3}\)

    \(\frac{1}{3}:\frac{a}{b}=\frac{2}{3}\times\frac{3}{4}\)

     \(\frac{1}{3}:\frac{a}{b}=\frac{1}{2}\)

            \(\frac{a}{b}=\frac{1}{3}:\frac{1}{2}\)

            \(\frac{a}{b}=\frac{1}{3}\times2\)

             \(\frac{a}{b}=2\)

\(c,\frac{a}{b}+\frac{3}{8}=\frac{5}{6}\)

               \(\frac{a}{b}=\frac{5}{6}-\frac{3}{8}\)

                \(\frac{a}{b}=\frac{11}{24}\)