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\(a.\frac{8}{7}+\frac{4}{7}\times\left(-\frac{6}{11}\right)-\frac{4}{7}\times\frac{5}{11}\)
\(=\frac{8}{7}+\frac{4}{7}\left(-\frac{6}{11}-\frac{5}{11}\right)\)
\(=\frac{8}{7}+\frac{4}{7}.\left(-1\right)\)
\(=\frac{8}{7}-\frac{4}{7}\)
\(=\frac{4}{7}\)

\(\frac{4}{5}\)+ \(\frac{1}{5}\): \(\frac{-2}{15}\)= \(\frac{4}{5}\)+ \(\frac{1}{5}\)* \(\frac{-15}{2}\)=\(\frac{4}{5}\) + \(\frac{-3}{2}\)= \(\frac{-7}{10}\)
b = \(\frac{-7}{12}\). (\(\frac{3}{11}\)+ \(\frac{-14}{11}\)) + \(\frac{5}{6}\)= \(\frac{-7}{12}\). (-1) + \(\frac{5}{6}\)= \(\frac{7}{12}\)+ \(\frac{10}{12}\)= \(\frac{17}{12}\)

6x+x=5^11-9+3^1
6x+x=5^2+3
6x+x=25+3
7x=28
=>x=28:7
=>x=4
tick nha
6x+x=5^11:5^9+3^1
6x+x=48828125:1953125+3
6x+x=25+3
6x+x=28
Vậy x=4 vì 6.4+4=28

a) => x-20=11
x-20= -11
=> x= 31
x= 9
tick nha kim thu quynh

a, x = -80
b, x = -11 hoặc -5
c, x =4
d, x thuộc 1 , 7
sorry mik ko bik dùng dấu thuộc nhé

1/7x-x=521:519+3.22-70
6x=52+3.4-1
6x=25+12-1
6x=25+11
6x=36
x=36:6
x=3
2/7x-2x=617:615+44:11
5x=62+4
5x=36+4
5x=40
x=40:5
x=8
3/6x+x=511:59+3
7x=52+3
7x=25+3
7x=28
x=28:7
x=4
a) 7x - x = 521: 519 + 3.22 - 70
6x = 52 + 3. 4 - 1
6x = 25 + 12 - 1
6x = 37 - 1
6x = 36
x = 36 : 6
x = 6
b) 7x - 2x = 617 : 615 + 44:11
5x = 62 + 4
5x = 36 +4
5x = 40
x = 40 :5
x = 8
c) 6x + x = 511 : 59 + 3
7x = 52 +3
7x = 25 +3
7x = 28
x = 28 : 7
x = 4
( -5/6 . x + 6/11 ) : x = 3/5
-5/6 . x : x + 6/11 : x = 3/5
-5/6 + 6/11 : x = 3/5
6/11 : x = 3/5 - (-5/6)
6/11 : x = 3/5 + 5/6
6/11 : x = 43/30
x = 6/11 : 43/30
x = 6/11 x 30/43
x = 180/473
\(\left(\dfrac{-5}{6}.x+\dfrac{6}{11}\right):x=\dfrac{3}{5}\)
\(\Rightarrow\dfrac{-5}{6}.x+\dfrac{6}{11}=\dfrac{3}{5}.x\)
\(\Rightarrow\dfrac{6}{11}=\dfrac{3}{5}.x+\dfrac{5}{6}.x\)
\(\Rightarrow\dfrac{6}{11}=\dfrac{43}{30}x\)
\(\Rightarrow x=\dfrac{6}{11}:\dfrac{43}{30}=\dfrac{180}{473}\)