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5 tháng 9 2019

3 9   x   6 8   =   1 3   x   3 4   =   1 4

24 tháng 8 2015

\(\frac{3}{9}+\frac{9}{15}+\frac{8}{12}=\frac{1}{3}+\frac{3}{5}+\frac{2}{3}=\left(\frac{1}{3}+\frac{2}{3}\right)+\frac{3}{5}=1+\frac{3}{5}=\frac{8}{5}\)

\(\frac{4}{10}+\frac{12}{32}+\frac{9}{15}=\frac{2}{5}+\frac{3}{8}+\frac{3}{5}=\left(\frac{2}{5}+\frac{3}{5}\right)+\frac{3}{8}=1+\frac{3}{8}=\frac{11}{8}\)

\(\left(\frac{4}{10}-\frac{8}{30}\right)\times\frac{6}{8}=\frac{2}{15}\times\frac{3}{4}=\frac{6}{60}=\frac{1}{10}\)

3 tháng 4 2016

a, 3/9+9/15+8/12=1/3+3/5+2/3=14/15+2/3=8/5

Bài 2:

a: 2/6x5/3=10/18=5/9

b: 11/9x5/10=55/90=11/18

c: 3/9x6/8=1/3x3/4=1/4

d: 4/9x12/16=48/144=1/3

e: 25/15x6/7=5/3x6/7=30/21=10/7

f: 6/10x15/20=90/200=9/20

27 tháng 2 2022

Bài 1

4/5 x 6/7= 24/35

2/9 x 1/2= 2/18= 1/9

1/2 x 8/3= 8/6= 4/3

7/9 x 6/5= 42/45= 14/15

8/7 x 5/9= 40/63

10/11 x 22/15= 220/165= 4/3

Bài 2

2/6 x 5/3= 1/3 x 5/3=5/9

11/9 x 5/10= 11/9 x 1/2= 11/18

3/9 x 6/8= 1/3 x 3/4 =3/12= 1/4

4/9 x 12/16= 4/9 x 3/4= 12/36= 1/3

25/15 x 6/7= 5/3 x 6/7= 30/21= 10/7

6/10 x 15/20= 3/5 x 3/4= 9/20

27 tháng 1 2022

2/6*7/5=1/3*7/5=7/15.

11/9*5/10=11/9*1/2=11/18.

3/9*6/8=1/3*3/4=3/12=1/4.

\(\frac{1}{4}+\frac{3}{5}=\frac{17}{20}\)

\(\frac{5}{2}+\frac{7}{9}=\frac{59}{18}\)

\(\frac{3}{2}+\frac{2}{3}=\frac{13}{6}\)

\(\frac{4}{5}+\frac{3}{2}=\frac{23}{10}\)

\(\frac{4}{5}+\frac{3}{15}=\frac{4}{5}+\frac{1}{5}=1\)

\(\frac{2}{3}+\frac{32}{24}=\frac{2}{3}+\frac{4}{3}=2\)

\(\frac{5}{6}+\frac{15}{18}=\frac{5}{6}+\frac{5}{6}=\frac{10}{6}=\frac{5}{3}\)

\(\frac{8}{15}+\frac{2}{3}=\frac{8}{15}+\frac{10}{15}=\frac{18}{15}=\frac{6}{5}\)

\(\frac{3}{7}+\frac{4}{8}=\frac{24}{56}+\frac{28}{56}=\frac{52}{56}=\frac{13}{14}\)

_HT_

14 tháng 5 2022

Murad trả lời đúng rồi đó! 

6 tháng 3 2022

a) 7/6 + 4/16 = 7/6 + 1/4 = 14/12 + 3/12 = 17/12

b) 2/12 + 15/6 = 1/6 + 15/6 = 16/6 = 8/3

c) 5/7 - 2/6 = 5/7 - 1/3 = 15/21 - 7/21 = 8/21

Chúc bạn học tốt.

😁😁😁

4/16=1/4

7/6+1/4=6/24+28/24=34/34=12/17

2/12=1/6

1/6+15/6=6/36+90/36=96/36=24/9

2/6=1/3

5/7-1/3=15/21-7/21=8/21

19 tháng 2 2017

1.

a) \(\frac{16}{24}-\frac{1}{3}=\frac{16}{24}-\frac{8}{24}=\)\(\frac{8}{24}=\frac{1}{3}\)

b) \(\frac{4}{5}-\frac{12}{60}=\frac{48}{60}-\frac{12}{60}=\frac{36}{60}=\frac{9}{15}\)

3.

a)\(\frac{17}{6}-\frac{2}{6}=\frac{17-2}{6}=\frac{15}{6}\)

b) \(\frac{16}{15}-\frac{11}{15}=\frac{16-11}{15}=\frac{5}{15}=\frac{1}{3}\)

c) \(\frac{19}{12}-\frac{13}{12}=\frac{19-13}{12}=\frac{6}{12}=\frac{1}{2}\)

11 tháng 6 2019

\(\frac{2}{3}+\frac{3}{9}+\frac{7}{5}\)

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

\(=\frac{10}{15}+\frac{5}{15}+\frac{21}{15}\)

\(=\frac{36}{15}\)

\(=\frac{12}{5}\)

\(\frac{2}{3}+\frac{3}{9}+\frac{7}{5}\)

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

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

=\(\frac{3}{3}+\frac{7}{5}\)

\(=1+\frac{7}{5}\)

=\(\frac{12}{5}\)

4 tháng 3 2022

\(\dfrac{6}{9}\)\(\times\dfrac{2}{8}\)=\(\dfrac{2}{3}\times\dfrac{1}{4}\)

         \(=\)\(\dfrac{1}{6}\)

tick mình nhé

4 tháng 3 2022

= 1/6 

k cho mk nha

HT

11 tháng 5 2020

rút gọn phân số :

4/5+21/15=4/5+7/5=11/5

8/9-25/45=8/9-5/9=3/9

tính :

5/6+2/7+15/6=5/6+15/6+2/7

=10/3+2/7=76/21

7/8-9/6.7/8=7/8-21/16=-7/16 

chúc bạn học tốt !!!

15 tháng 2 2023

a) \(\dfrac{5}{6}-\dfrac{2}{14}\)

\(=\dfrac{5}{6}-\dfrac{1}{7}\)

\(=\dfrac{35}{42}-\dfrac{6}{42}\)

\(=\dfrac{29}{42}\)

b) \(\dfrac{5}{20}-\dfrac{1}{6}\)

\(=\dfrac{1}{4}-\dfrac{1}{6}\)

\(=\dfrac{3}{12}-\dfrac{2}{12}\)

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

c) \(\dfrac{5}{9}-\dfrac{3}{12}\)

\(=\dfrac{5}{9}-\dfrac{1}{4}\)

\(=\dfrac{20}{36}-\dfrac{9}{36}\)

\(=\dfrac{11}{36}\)

d) \(8-\dfrac{4}{6}\)

\(=\dfrac{48}{6}-\dfrac{4}{6}\)

\(=\dfrac{44}{6}=\dfrac{22}{3}\).