x - 12/81 = 50/75

x             = 50/75 + 12/81

x             = 22/27

x -12/81 = 50/75 

x   = 50/75 + 12 /81 

x   22/27

( 55 + 65 +75 + 85 +95 ) : y = 5

375:y=5

y=75

(55 + 65 + 75 + 85 + 95) : y =5

475 : y = 5

y = 475 : 5

y = 95

Học tốt

55 . y  + 46 . y - y  = 3600

y(55+46-1)=3600

y.100=3600

y=36

x + 2 / 44 = 24 / 32 

x=31/44

HT

x + 2/44 = 24/32

x             = 24/32 - 2/44

x             = 31/44

x - 12/81 = 50/75

x             = 50/75 + 12/81

x             = 22/27

\(x-\frac{12}{81}=\frac{50}{75}\)

\(x-\frac{12}{81}=\frac{2}{3}\)

\(x=\frac{2}{3}+\frac{12}{81}\)

\(x=\frac{22}{27}\)

\(\left(x-273\right)\left(1+3+5+...+2005\right)=0\)

Vì \(\left(1+3+5+...+2005\right)\ne0\Rightarrow x-273=0\)

\(\Leftrightarrow x=273\)

(x-273) . (1+3+5+...+2005)=0

=>(x-273) =0

x = 273

Học tốt

\(\frac{1}{2}\)\(+\)\(\frac{1}{6}\)\(+\)\(\frac{1}{12}\)\(+\)\(\frac{1}{20}\)\(+\)\(\frac{1}{30}\)\(+\)\(\frac{1}{x}\)\(=\)\(\frac{41}{42}\)

\(\frac{1}{1.2}\)\(+\)\(\frac{1}{2.3}\)\(+\)\(\frac{1}{3.4}\)\(+\)\(\frac{1}{4.5}\)\(+\)\(\frac{1}{5.6}\)\(+\)\(\frac{1}{x}\)\(=\)\(\frac{41}{42}\)

\(\frac{1}{1}\)\(-\)\(\frac{1}{6}\)\(+\)\(\frac{1}{x}\)\(=\)\(\frac{41}{42}\)

\(\frac{5}{6}\)\(+\)\(\frac{1}{x}\)\(=\)\(\frac{41}{42}\)

\(\frac{1}{x}\)\(=\)\(\frac{1}{7}\)

\(x=7\)

• ╰☆☆нєν✰.✰νũ❤‿✶(*•.¸♡ţęąɱ ƒŗęę ƒįŗę❤☆) sai rồi nhé

\(\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+\frac{1}{30}+\frac{1}{x}=\frac{41}{42}\)

\(\Leftrightarrow\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+\frac{1}{5.6}+\frac{1}{x}=\frac{41}{42}\)

\(\Leftrightarrow\frac{5}{6}+\frac{1}{x}=\frac{41}{42}\Leftrightarrow\frac{1}{x}=\frac{41}{42}-\frac{5}{6}=\frac{1}{42}\Leftrightarrow x=42\)

\(\frac{9}{14}-\frac{x}{7}:\frac{5}{3}=\frac{3}{14}\)

\(\frac{9}{14}-\frac{x}{7}=\frac{3}{14}.\frac{5}{3}\)

\(\frac{9}{14}-\frac{x}{7}=\frac{5}{14}\)

\(\frac{x}{7}=\frac{9}{14}-\frac{5}{14}\)

\(\frac{x}{7}=\frac{2}{7}\)

\(\Rightarrow x=2\)

\(\frac{9}{14}\)\(-\)\(\frac{x}{7}\)\(:\)\(\frac{5}{3}\)\(=\frac{3}{14}\)

\(\frac{9}{14}\)\(-\)\(\frac{3x}{35}\)\(=\frac{3}{14}\)

\(\frac{3x}{35}\)\(=\)\(\frac{3}{7}\)

\(3x=15\)

\(x=5\)

454545/515151>650650/910910

Sau lần lấy đầu tiên, trong thùng còn số ki-lô-gam đường là:

      28,75 – 10,5 =  18,25 ( kg ) 

Sau hai lần lấy, trong thùng còn số ki-lô-gam đường là:

      18,25 – 8 = 10,25 ( kg )

                 Đáp số :  10,25 kg .

#Ry

=18,25

=10,25 hok tốt nha bn