Đăng đề luôn đi bn êi

1/x+x:12-30=61

  x+x:12      =61+30

 x               =84

\(=\dfrac{6\cdot18}{12\cdot48}=\dfrac{6}{12}\cdot\dfrac{18}{48}=\dfrac{1}{2}\cdot\dfrac{3}{8}=\dfrac{3}{16}\)

\(\frac{2.4}{6.18}=\frac{2.2.2}{2.3.3.2.3}=\frac{2}{7}\)

mk đã làm xog, đúng tk cho mk 

2 x 4 / 6 x 18

= 8 / 108

= 2 / 27

\(2.2.2/2.3.2.2.2=1/2.3=1/6\)

\(\frac{2.4}{6.18}=\frac{1.2}{3.9}=\frac{2}{27}\)

\(\frac{2.4}{6.18}=\frac{8}{108}=\frac{2}{27}\)

cách 1 :

\(\frac{2.4}{6.18}=\frac{8}{108}=\frac{8:4}{108:4}=\frac{2}{27}\)

Cách 2 :

\(\frac{2.4}{6.18}=\frac{1.2}{3.9}=\frac{2}{27}\)

cách 1

\(\frac{2}{4}\times\frac{6}{18}=\frac{1}{2}\times\frac{1}{3}=\frac{1}{6}\)

cách 2

\(\frac{2}{4}\times\frac{6}{18}=\frac{2\times6}{4\times18}=\frac{1\times1}{2\times3}=\frac{1}{6}\)

k cho mình nha

6,18 + 5,15 + 8,12

= 11,33 + 8,12

= 19,45

đáp án là 19,45

\(\dfrac{2^6.18+2^7}{2^6.5^2-2^6.3}=\dfrac{2^6\left(18+2\right)}{2^6.\left(5^2-3\right)}=\dfrac{20}{5^2-3}=\dfrac{20}{25-3}=\dfrac{20}{22}=\dfrac{10}{11}\)

\(=\dfrac{2^6.18+2^6.2}{2^6.25-2^6.3}=\dfrac{2^6\left(18+2\right)}{2^6\left(25-3\right)}=\dfrac{18+2}{25-3}=\dfrac{20}{22}=\dfrac{10}{11}\)

10/11

a)2.4/6.18=2.2.2/2.3.3.3.2=2/3.3.3=2/27

còn laj thì tương tự