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\(=\left(\frac{-5}{9}+\frac{-3}{9}\right)+\left(\frac{3}{5}+\frac{-2}{5}\right)\)
\(=\frac{-8}{9}+\frac{1}{5}\)
\(=\frac{-40}{45}+\frac{9}{45}\)
\(=\frac{-31}{45}\)
T I C K nha
Ta có : \(5\cdot\left(\frac{1}{5}+\frac{1}{17}\right)-\left(\frac{2}{5}+\frac{2}{17}+\frac{9}{15}+\frac{12}{68}\right)\)
\(=\) \(5\cdot\frac{1}{5}+5\cdot\frac{1}{17}-\left(\frac{2}{5}+\frac{2}{17}+\frac{3}{5}+\frac{3}{17}\right)\)
\(=\) \(1+\frac{5}{17}-\left[\left(\frac{2}{5}+\frac{3}{5}\right)+\left(\frac{2}{17}+\frac{3}{17}\right)\right]\)
\(=\) \(1+\frac{5}{17}-\left(1+\frac{5}{17}\right)\)
\(=\) \(1+\frac{5}{17}-1-\frac{5}{17}\)
\(=\)\(0\)
Vậy ...
Tk ủng hộ mk nha các bn ❣❣ C.ơn nhiều ^^
\(\frac{1}{8}.15\frac{2}{5}+1\frac{4}{5}.\frac{1}{8}-17\frac{1}{5}.\frac{1}{8}\)
=\(\frac{77}{40}+\frac{9}{40}-\frac{86}{40}\)
=\(\frac{0}{40}=0\)
\(\frac{1}{8}.15\frac{2}{5}+1\frac{4}{5}.\frac{1}{8}-17\frac{1}{5}.\frac{1}{8}\)
\(\frac{1}{8}.\left(15\frac{2}{5}+1\frac{4}{5}-17\frac{1}{5}\right)\)
\(\frac{1}{8}.\left(\left(15+1-17\right)+\left(\frac{2}{5}+\frac{4}{5}-\frac{1}{5}\right)\right)\)
\(\frac{1}{8}.\left(\left(-1\right)+1\right)\)
\(\frac{1}{8}.0\)
\(0\)
Có \(\frac{\frac{2}{7}+\frac{2}{5}+\frac{2}{17}-\frac{2}{239}}{\frac{3}{239}-\frac{3}{7}-\frac{3}{5}-\frac{3}{17}}\) : \(\frac{x}{3}\) = 2
\(\frac{2.\left(\frac{1}{7}+\frac{1}{5}+\frac{1}{17}-\frac{1}{239}\right)}{-3.\left(\frac{-1}{239}+\frac{1}{7}+\frac{1}{5}+\frac{1}{17}\right)}\) : \(\frac{x}{3}\) = 2
\(\frac{-2}{3}\) : \(\frac{x}{3}\) = 2
\(\frac{-2}{3}\) . \(\frac{3}{x}\) = 2
\(\frac{-2}{x}\) = 2
\(\Rightarrow\) x = -1
Vậy x = -1
Chúc bạn học tốt !!! ^^ #Mango
( 5/17+-2/17)+(-9/15+-2/5)
=(5/17+-2/17)+(-9/15+-6/15)
=3/17+-15/15
=3/17+(-1)
=(-14)/17
k mình nha! căm ơn bạn!!!!
= (5/17-2/17) - (9/15+2/5)
= 3/17 - 1
= -14/17
Tk mk nha