Ta có: \(M=\dfrac{9}{40}-\dfrac{11}{60}+\dfrac{13}{84}-\dfrac{15}{112}\)

\(=\dfrac{378}{1680}-\dfrac{308}{1680}+\dfrac{260}{1680}-\dfrac{225}{1680}\)

\(=\dfrac{105}{1680}=\dfrac{1}{16}\)

M=9/40-11/60+13/84-15/112

M=27/120-22/120+52/336-45/336

M=1/24+1/48

M=2/48+1/48=3/48=1/16

\(M=\dfrac{9}{40}-\dfrac{11}{60}+\dfrac{13}{84}-\dfrac{15}{112}\)

\(M=\left(\dfrac{90}{40}-\dfrac{11}{60}\right)+\left(\dfrac{13}{84}-\dfrac{15}{112}\right)\)

\(M=\dfrac{27}{120}-\dfrac{22}{120}+\dfrac{52}{336}-\dfrac{45}{336}\)

\(M=\dfrac{5}{120}+\dfrac{7}{336}\)

\(M=\dfrac{1}{24}+\dfrac{1}{48}\)

\(M=\dfrac{3}{48}=\dfrac{1}{16}\)

M=\(\dfrac{9}{40}-\dfrac{11}{60}+\dfrac{13}{84}-\dfrac{15}{112}\)

M=\(\dfrac{1}{24}+\dfrac{13}{84}-\dfrac{15}{112}\)

M=\(\dfrac{11}{56}-\dfrac{15}{112}\)

M=\(\dfrac{1}{16}\)

\(M=\frac{1}{16}\)

M= 9/40-11/60+13/84-15/112

M=378/1680-308/1680+260/1680-225/1680

M=\(\frac{378-308+260-225}{1680}\)

M=\(\frac{105}{1680}\)

M= \(\frac{1}{16}\)

M=1/16 pn nha

M=1/16 tin mình đi

\(M=\frac{9}{40}-\frac{11}{60}+\frac{13}{84}-\frac{15}{112}\)      

\(M=\left(\frac{9}{40}-\frac{11}{60}\right)+\left(\frac{13}{84}-\frac{15}{112}\right)\)   

\(M=\frac{1}{24}+\frac{1}{48}\)    

\(M=\frac{1}{16}\)

\(M=\frac{1}{16}=0,0625\)

Dễ

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17/112

M= \(\dfrac{9}{40}-\dfrac{11}{60}+\dfrac{13}{84}-\dfrac{15}{112}\)

= (\(\dfrac{9}{40}-\dfrac{11}{60}\)) + (\(\dfrac{13}{84}-\dfrac{15}{112}\))

= (\(\dfrac{27}{120}-\dfrac{22}{120}\)) + (\(\dfrac{52}{336}-\dfrac{45}{336}\))

= \(\dfrac{1}{24}+\dfrac{1}{48}\)

= \(\dfrac{2}{48}+\dfrac{1}{48}\)

=\(\dfrac{3}{48}=\dfrac{1}{16}\)