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\(\left(\frac{9}{15}+\frac{8}{11}\right)+\frac{6}{15}=\left(\frac{9}{15}+\frac{6}{15}\right)+\frac{8}{11}\)
\(=1+\frac{8}{11}=\frac{19}{11}\)
\(\left(\frac{26}{17}+\frac{15}{34}\right)+\left(\frac{8}{17}+\frac{19}{34}\right)=\left(\frac{26}{17}+\frac{8}{17}\right)+\left(\frac{15}{34}+\frac{19}{34}\right)\)
\(=2+1=3\)
\(\left(\frac{9}{15}+\frac{8}{11}\right)+\frac{6}{15}\)
\(=\left(\frac{9}{15}+\frac{6}{15}\right)+\frac{8}{11}\)
\(=1+\frac{8}{11}\)
\(=\frac{19}{11}\)
\(\left(\frac{26}{17}+\frac{15}{34}\right)+\left(\frac{8}{17}+\frac{19}{34}\right)\)
\(=\frac{26}{17}+\frac{15}{34}+\frac{8}{17}+\frac{19}{34}\)
\(=\left(\frac{26}{17}+\frac{8}{17}\right)+\left(\frac{15}{34}+\frac{19}{34}\right)\)
\(=2+1\)
\(=3\)
\(\frac{17}{8}+\frac{28}{15}-\frac{8}{15}=\frac{17}{8}+\frac{4}{3}=\frac{83}{24}=3\frac{11}{24}\)
=> chọn a
17/15 x 4/11 + 8/15 x 4/11
= 4/11 x (17/15 + 8/15)
= 4/11 x 5/3
= 20/33
\(\frac{13}{19}\times\left(\frac{19}{13}-\frac{7}{9}\right)\)
\(=\frac{13}{19}\times\frac{19}{13}-\frac{13}{19}\times\frac{7}{9}\)
\(=1-\frac{117}{361}\)
\(=\frac{244}{361}\)
\(\frac{17}{15}\times\frac{4}{11}+\frac{8}{15}\times\frac{4}{11}\)
\(=\frac{4}{11}\times\left(\frac{17}{15}+\frac{8}{15}\right)\)
\(=\frac{4}{11}\times\frac{5}{3}\)
\(=\frac{20}{33}\)
a) Phân số lớn nhất là : 91/93
b) Phân số lớn nhất là : 7/4
đúng thì k cho tớ nha
thank you very much
a, 1. \(\dfrac{2}{17}\)
2. \(22\)
3. 4
b,
1. \(\dfrac{8}{5}\)
2. \(\dfrac{176}{5}\)
3. \(\dfrac{28}{5}\)
4. \(\dfrac{3}{10}\)
5. \(\dfrac{163}{5}\)
6. \(\dfrac{9}{20}\)
a) \(\dfrac{12}{17}:6=\dfrac{12}{17}\cdot\dfrac{1}{6}=\dfrac{2}{17}\)
Lời giải:
$\frac{15}{8}-\frac{17}{11}=\frac{15\times 11-17\times 8}{8\times 11}$
$=\frac{29}{88}$
quy đồng ra thôi :))))