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(-5/11:13/8-5/11:13/5)+-1/33
= (-5/11.8/13-5/11.5/13)+-1/33
= -5/11.(8/13+5/13)+-1/33
=-5/11.1+-1/33
=-5/11+-1/33
=-16/33
mk lm đại ko bt đúng hay ko
test lại dùm mk nha
\(=\dfrac{-5}{11}\left(\dfrac{13}{8}+\dfrac{13}{5}\right)+\dfrac{-1}{33}\)
\(=\dfrac{-5}{11}\cdot\dfrac{13\cdot13}{40}+\dfrac{-1}{33}\)
\(=\dfrac{-1}{8}\cdot\dfrac{169}{11}+\dfrac{-1}{33}=\dfrac{-169}{88}-\dfrac{1}{33}=\dfrac{-515}{264}\)
1: \(\dfrac{4}{23}+\dfrac{5}{21}+\dfrac{1}{2}-\dfrac{4}{23}+\dfrac{16}{21}\)
\(=1+\dfrac{1}{2}\)
\(=\dfrac{3}{2}\)
2: \(\left(\dfrac{1}{3}+\dfrac{12}{67}+\dfrac{13}{41}\right)-\left(\dfrac{79}{67}-\dfrac{28}{41}\right)\)
\(=\dfrac{1}{3}+\dfrac{12}{67}+\dfrac{13}{41}-\dfrac{79}{67}+\dfrac{28}{41}\)
\(=\dfrac{1}{3}\)
Ta có : B=(1/5-1/5)-(3/7-3/7)+(5/9-5/9)-(2/11-2/11)+(7/13-7/13)-9/16
B=-9/16
Trả lời:
\(\left(\frac{-5}{11}\text{÷}\frac{13}{8}-\frac{5}{11}\text{÷}\frac{13}{5}\right)+\frac{-1}{33}\)
\(=\left(\frac{-5}{11}.\frac{8}{13}+\frac{-5}{11}.\frac{5}{13}\right)+\frac{-1}{33}\)
\(=\frac{-5}{11}.\left(\frac{8}{13}+\frac{5}{13}\right)+\frac{-1}{33}\)
\(=\frac{-5}{11}+\frac{-1}{33}\)
\(=\frac{-15-1}{33}\)
\(=\frac{-16}{33}\)
#Huyền Anh