K
Khách

Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.

7 tháng 11 2017

24 36   -   6 12   =   2 3   -   1 2   =   4 6   -   3 6   =   1 6

3 tháng 3 2022

a, 15/25 - 3/21 = 3/5 - 1/7 = 21/35 - 5/35 = 18/35

b, 24/36 - 6/12 = 2/3 - 1/2 = 4/6 - 3/6 = 1/6

3 tháng 3 2022

a)15/25-3/21=3/5-1/7=16/35                b)24/36-6/12=2/3-1/2=1/6

10 tháng 3 2023

\(\dfrac{15}{35}+\dfrac{7}{10}=\dfrac{3}{7}+\dfrac{7}{10}=\dfrac{30}{70}+\dfrac{49}{70}=\dfrac{79}{70}\)

\(\dfrac{27}{72}+\dfrac{11}{24}=\dfrac{3}{8}+\dfrac{11}{24}=\dfrac{9}{24}+\dfrac{11}{24}=\dfrac{20}{24}=\dfrac{5}{6}\)

\(\dfrac{6}{12}+\dfrac{7}{6}=\dfrac{1}{2}+\dfrac{7}{6}=\dfrac{3}{6}+\dfrac{7}{6}=\dfrac{10}{6}=\dfrac{5}{3}\)

b: 12/20+6/18=3/5+1/3=9/15+5/15=14/15

c: 8/12+20/30=2/3+2/3=4/3

d: 10/12+12/36=5/6+2/6=7/6

b: \(=\dfrac{3}{7}\cdot\dfrac{5}{7}\cdot\dfrac{6}{7}=\dfrac{90}{343}\)

c: \(=\dfrac{4}{9}\cdot\dfrac{5}{9}\cdot\dfrac{3}{7}=\dfrac{20}{189}\)

d: \(=\dfrac{1}{3}\cdot\dfrac{5}{12}\cdot\dfrac{5}{12}=\dfrac{25}{432}\)

27 tháng 2 2022

d

 

4 tháng 5 2020

Nay rảnh lại qua làm mấy bài lớp 4 ^^

Tui làm luôn kh ghi đề nhá

1, 

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

\(\frac{2}{5}+\frac{2}{3}=\frac{16}{15}\)

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

2, 

\(\cdot\frac{3}{7}+\frac{6}{5}+\frac{4}{7}\)

\(=\frac{3}{7}+\frac{4}{7}+\frac{6}{5}\)

\(=1+\frac{6}{5}\)

\(=\frac{11}{5}\)

\(\cdot\frac{6}{4}+\frac{7}{3}+\frac{4}{4}+\frac{3}{3}\)

\(=\frac{6}{4}+\frac{4}{4}+\frac{7}{3}+\frac{3}{3}\)

\(=\frac{10}{4}+\frac{10}{3}\)

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

8 tháng 1 2022

 

 

23+815=6523+815=65

25+23=161525+23=1615

23+56=3223+56=32

2, 

⋅37+65+47⋅37+65+47

=37+47+65=37+47+65

=1+65=1+65

=115=115

⋅64+73+44+33⋅64+73+44+33

=64+44+73+33=64+44+73+33

=104+103=104+103

=356

20 tháng 2 2023

\(\dfrac{6}{36}+\dfrac{5}{6}=\dfrac{1}{6}+\dfrac{5}{6}=\dfrac{6}{6}=1\\ \dfrac{1}{4}+\dfrac{5}{30}=\dfrac{1}{4}+\dfrac{1}{6}=\dfrac{6}{24}+\dfrac{4}{24}=\dfrac{10}{24}=\dfrac{5}{12}\\ \dfrac{5}{56}+\dfrac{3}{21}=\dfrac{5}{56}+\dfrac{1}{7}=\dfrac{5}{56}+\dfrac{8}{56}=\dfrac{13}{56}\\\dfrac{12}{18}+\dfrac{12}{42}=\dfrac{2}{3}+\dfrac{2}{7}=\dfrac{14}{21}+\dfrac{6}{21}=\dfrac{20}{21} \)

20 tháng 2 2023

6/36 + 5/6=1/6+5/6=6/6=1

1/4 + 5/30=1/4+1/6=6/24+4/24=10/24=5/12

5/56 + 3/21=5/56=1/7=5/56+8/56=13/56

12/18 + 12/42=2/3+2/7=14/21+6/21=20/21

4 tháng 3 2021

A) \(\dfrac{5}{10}\) - \(\dfrac{2}{15}\) = \(\dfrac{1}{2}\) -\(\dfrac{2}{15}\) =\(\dfrac{15}{30}\) -\(\dfrac{4}{30}\) =\(\dfrac{11}{30}\)

B)\(\dfrac{5}{20}\)-\(\dfrac{1}{6}\)=\(\dfrac{1}{4}\)-\(\dfrac{1}{6}\)=\(\dfrac{6}{24}\)-\(\dfrac{4}{24}\)=\(\dfrac{2}{24}\)=\(\dfrac{1}{12}\)

C)\(\dfrac{6}{18}\)-\(\dfrac{6}{24}\)=\(\dfrac{1}{3}\)-\(\dfrac{1}{4}\)=\(\dfrac{4}{12}\)-\(\dfrac{3}{12}\)=\(\dfrac{1}{12}\)

D)\(\dfrac{5}{9}\)-\(\dfrac{3}{12}\)=\(\dfrac{5}{9}\)-\(\dfrac{1}{4}\)=\(\dfrac{20}{36}\)-\(\dfrac{9}{36}\)=\(\dfrac{11}{36}\)

6 tháng 4 2022

Hơi nhiều nhưng mn ráng lm nhé tối gủi cũng đc

6 tháng 4 2022

.......... ok

5 tháng 3 2023

A) \(\dfrac{5}{10}-\dfrac{2}{15}\)

\(=\dfrac{1}{2}-\dfrac{2}{15}\)

\(=\dfrac{15}{30}-\dfrac{4}{30}\)

\(=\dfrac{11}{30}\)

B)\(\dfrac{5}{20}-\dfrac{1}{6}\)

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

\(=\dfrac{6}{24}-\dfrac{4}{24}\)

\(=\dfrac{2}{24}=\dfrac{1}{12}\)

C) \(\dfrac{6}{18}-\dfrac{6}{24}\)

\(=\dfrac{1}{3}-\dfrac{1}{4}\)

\(=\dfrac{4}{12}-\dfrac{3}{12}\)

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

D) \(\dfrac{5}{9}-\dfrac{3}{12}\)

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

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

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

a: =1/2-2/15

=15/30-4/30

=11/30

b: =1/4-1/6

=3/12-2/12

=1/12

c: =1/3-1/4

=1/12

d: =20/36-9/36

=11/36

1 tháng 3 2018

\(\frac{12}{84}+\frac{36}{63}\)

\(=\frac{1}{7}+\frac{4}{7}=\frac{5}{7}\)

học tốt ~~~

1 tháng 3 2018

\(\frac{12}{84}=\frac{1}{4}\)

\(\frac{36}{63}=\frac{4}{7}\)

Ta có : 

\(\frac{1}{4}=1-\frac{3}{4}\)

\(\frac{4}{7}=1-\frac{3}{7}\)

Mà \(\frac{3}{4}>\frac{3}{7}\) nên \(\frac{1}{4}< \frac{4}{7}\)

\(\Rightarrow\) \(\frac{12}{84}< \frac{36}{63}\) .