`a,MSC:45`

`7/9=(7xx5)/(9xx5)=35/45`

`2/5=(2xx9)/(5xx9)=18/35`

`b,MSC:21`

`6/7=(6xx3)/(7xx3)=18/21`

`17/21` giữ nguyên

`c,MSC:36`

`2/3=(2xx12)/(3xx12)=24/36`

`1/4=(1xx9)/(4xx9)=9/36`

`5/9=(5xx4)/(9xx4)=20/36`

\(a,\dfrac{7}{9}=\dfrac{7.5}{9.5}=\dfrac{35}{45}\\\dfrac{2}{5}=\dfrac{2.9}{5.9}=\dfrac{18}{45}\\ b,\dfrac{6}{7}=\dfrac{6.3}{7.3}=\dfrac{18}{21}\\ \dfrac{17}{21}giữnguyên\\ c,\dfrac{2}{3}=\dfrac{2.12}{3.12}=\dfrac{24}{36}\\ \dfrac{1}{4}=\dfrac{1.9}{4.9}=\dfrac{9}{36}\\ \dfrac{5}{9}=\dfrac{5.4}{9.4}=\dfrac{20}{36}\)

2/5 + x = 15/20

2/5 + x = 3/4

x = 3/4 - 2/5 

x = 7/20

8/9 - 2/9 : x = 2/3

2/9 : x = 8/9 - 2/3 

2/9 : x = 2/9

x = 2/9 : 2/9

x = 1

\(\frac{2}{5}+x=\frac{15}{20}\)

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

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

\(x=\frac{7}{20}\)

\(\frac{8}{9}-\frac{2}{9}:x=\frac{2}{3}\)

\(\frac{2}{9}:x=\frac{8}{9}-\frac{2}{3}\)

\(\frac{2}{9}:x=\frac{2}{9}\)

\(x=\frac{2}{9}:\frac{2}{9}\)

\(x=1\)

Mik làm chi tiết nhé, bạn có thể lược 1 số phần nếu thích

\(\frac{2}{5}+x=\frac{15}{20}\)

=>\(\frac{2}{5}+x=\frac{3}{5}\)

=>\(x=\frac{3}{5}-\frac{2}{5}\)

=> \(x=\frac{1}{5}\)

\(\frac{8}{9}-\frac{2}{9}:x=\frac{2}{3}\)

=> \(\frac{8}{9}-\frac{2}{9}:x=\frac{6}{9}\)

=> \(\frac{2}{9}:x=\frac{8}{9}-\frac{6}{9}\)

=>\(\frac{2}{9}:x=\frac{2}{9}\)

=> \(x=\frac{2}{9}:\frac{2}{9}\)

=> \(x=1\)

1+1:3=1+3=4

0,99999999999

1+1:3=1+1/3=4/3

21600l

21,6 m3 = 21600l

tuck mk nha

21600 bạn ơi

?!

:))

Spam ko zui đâu cj:)

sqrt la can nha 

no hiểu ??????

méo hiểu

0

0

0

00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

Ta có 7a + 11b chia hết 3

\(\Rightarrow\)2.(7a+11b) chia hết cho 3

\(\Rightarrow\)14a + 22b chia hết cho 3

\(\Rightarrow\)7.(2a + b) + 15b chia hết cho 3

Vì 15b chia hết cho 3 \(\Rightarrow\)7.(2a + b) chia hết cho 3

\(\Rightarrow\)2a + b chia hết cho 3(đpcm)