\(x+\frac{4}{5}=\frac{45}{5}-\left(\frac{3}{7}+\frac{3}{5}\right)\)
\(x+\frac{4}{5}=9-\frac{36}{35}\)
\(x+\frac{4}{5}=\frac{279}{35}\)
\(\Rightarrow x=\frac{251}{35}\)
\(x+\frac{4}{5}=\frac{45}{5}-\left(\frac{3}{7}+\frac{3}{5}\right)\)
\(\Leftrightarrow x+\frac{4}{5}=9-\left(\frac{3}{7}+\frac{3}{5}\right)\)
\(\Leftrightarrow x+\frac{4}{5}=9-\frac{3}{7}-\frac{3}{5}\)
\(\Leftrightarrow x+\frac{4}{5}=\frac{315}{35}-\frac{15}{35}-\frac{21}{35}\)
\(\Leftrightarrow x+\frac{4}{5}=\frac{279}{35}\)
\(\Leftrightarrow x=\frac{279}{35}-\frac{4}{5}\)
\(\Leftrightarrow x=\frac{251}{35}\)
\(\frac{5}{7}+\frac{x}{35}=\frac{4}{5}\)
\(\Leftrightarrow\frac{25}{35}+\frac{x}{35}=\frac{28}{35}\)
\(\Leftrightarrow25+x=28\)
\(\Leftrightarrow x=28-25\)
\(\Leftrightarrow x=3\)
\(\frac{5}{7}+\frac{x}{35}=\frac{4}{5}\)
\(\frac{x}{35}=\frac{4}{5}-\frac{5}{7}\)
\(\frac{x}{35}=\frac{3}{35}\)
\(\Leftrightarrow x=3\)
a) x + 4/5 = 45/5 - ( 3/7 + 3/5)
x + 4/5 = 45/5 - (15/35 + 21/35)
x + 4/5 = 45/5 - 36/35
x + 4/5 = 315/35 - 36/35
x + 4/5 = 279/35
x = 279/35 - 4/5
x = 279/35 - 28/35
x = 251/35
#Hoq chắc _ Baccanngon
\(x\) \(+\) \(\frac{4}{5}\) \(=\) \(\frac{45}{5}\) \(-\) \(\left(\frac{3}{7}+\frac{3}{5}\right)\)
\(=\) \(x\) \(+\) \(\frac{4}{5}\) \(=\) \(\frac{45}{5}\) \(-\) \(\left(\frac{15}{35}+\frac{21}{35}\right)\)
\(=\) \(x\) \(+\) \(\frac{4}{5}\) \(=\) \(\frac{45}{5}\) \(-\) \(\frac{36}{35}\)
\(=\) \(x\) \(+\) \(\frac{4}{5}\) \(=\) \(\frac{315}{35}\) \(-\) \(\frac{36}{35}\)
\(=\) \(x\) \(+\) \(\frac{4}{5}\) \(=\) \(\frac{279}{35}\)
\(x\) \(=\) \(\frac{279}{35}\) \(-\) \(\frac{28}{35}\)
\(x\) \(=\) \(\frac{251}{35}\)
\(=\) \(x\) \(+\) \(\frac{4}{5}\)
a, x + 4/5 = 45/5 - 36/35
x + 4/5 = 279/35
x = 279/35 - 4/5
x = 251/35
b, x/35 = 4/5 - 5/7
x/35 = 3/35
x = 3
học giỏi :)))
x+4/5=45/5-[3/7+3/5]
x+4/5= 45/5 -15/35 + 21/35
x+4/5= 45/5 -36/35
x = 45/5-4/5
x = 41/5
x =41/5-36/35
x = 1255/40
