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\(a/\frac{7}{9}-\frac{x}{3}=\frac{1}{9}\)
\(\Rightarrow\frac{x}{3}=\frac{7}{9}-\frac{1}{9}\)
\(\Rightarrow\frac{x}{3}=\frac{2}{3}\)
\(\Rightarrow x=2\)
Vậy \(x=2\)
\(b/\frac{1}{x}-\frac{-2}{15}=\frac{7}{15}\)
\(\Rightarrow\frac{1}{x}=\frac{7}{15}+\frac{-2}{15}\)
\(\Rightarrow\frac{1}{x}=\frac{1}{3}\)
\(\Rightarrow x=3\)
Vậy \(x=3\)
\(c/\frac{-11}{14}-\frac{-4}{x}=\frac{-3}{14}\)
\(\Rightarrow\frac{-4}{x}=\frac{-11}{14}-\frac{-3}{14}\)
\(\Rightarrow\frac{-4}{x}=\frac{-4}{7}\)
\(\Rightarrow x=7\)
Vậy \(x=7\)
\(d/\frac{x}{21}-\frac{2}{3}=\frac{5}{21}\)
\(\Rightarrow\frac{x}{21}=\frac{5}{21}+\frac{2}{3}\)
\(\Rightarrow\frac{x}{21}=\frac{19}{21}\)
\(\Rightarrow x=19\)
Vậy \(x=19\)
#Mạt Mạt#
\(a,\frac{5}{7}+x=\frac{29}{21}\)
\(x=\frac{29}{21}-\frac{5}{7}\)
\(x=\frac{2}{3}\)
\(b,\frac{15}{2}-x=\frac{21}{14}\)
\(x=\frac{15}{2}-\frac{21}{14}\)
\(x=\frac{6}{1}\Leftrightarrow6\)
a) 5/7 +x= 29/21
=> x= 29/21 - 5/7
=>x= 14/21= 2/3
b) 15/2 -x= 21/14
<=> 15/2 -x= 3/2
=> x= 15/2 -3/2
=>x= 6
7,5x:\(\frac{50}{21}\)=\(\frac{64}{25}\)
7,5x = \(\frac{64}{25}.\frac{50}{21}\)
7,5x = \(\frac{128}{21}\)
x = \(\frac{128}{21}:7,5\)
x = \(\frac{256}{315}\)
Ta có:
-15/21=x/14=35/y=z/-56 =>x/14=35/y=z/-56=-5/7
=>x=-5*14/7=-10 ; y=35/(-5/7)=-49 ; z=-56*-5/7=40
21-21:(15-4x)=14
21:(15-4x)=21-14
21:(15-4x)=7
15-4x=21:7
15-4x=3
4x=15-3
4x=12
x=12:4
x=3
21-21:(15-4x)=14
21:(15-4x)=21-14
21:(15-4x)=7
15-4x=21:7
15-4x=3
4x=15-3
4x=12
x=12:4
x=3
tick cho mk nha