4:
\(M=\dfrac{3\left(\dfrac{1}{4}+\dfrac{1}{5}+\dfrac{1}{7}-\dfrac{1}{11}\right)}{6\left(\dfrac{1}{4}+\dfrac{1}{5}+\dfrac{1}{7}-\dfrac{1}{11}\right)}=\dfrac{3}{6}=\dfrac{1}{2}\)
\(N=\dfrac{2\left(\dfrac{1}{3}+\dfrac{1}{5}-\dfrac{1}{7}-\dfrac{1}{11}\right)}{6\left(\dfrac{1}{3}+\dfrac{1}{5}-\dfrac{1}{7}-\dfrac{1}{11}\right)}=\dfrac{2}{6}=\dfrac{1}{3}\)
5:
a: =>x-1/5=1/11
=>x=1/11+1/5=16/55
b: =>x/25=-21/90=-7/30
=>x=-7/30*25=-7*5/6=-35/6
c: =>x+7/5=1/6
=>x=1/6-7/5=-37/30
d: =>x:5/11=-4/2=-2
=>x=-2*5/11=-10/11
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