Cześć ;-)
Od a) do c)
[tex]a] \ -4\cdot(-2-11)=-4\cdot(-13)=\boxed{52}\\\\b] \ -7+2\cdot(-5)=-7+(-10)=-(7+10)=\boxed{-17}\\\\c] \ -11-12:(-6)=-11+2=-(11-2)=\boxed{-9}[/tex]
Od d) do f)
[tex]d] \ -8-5\cdot(-4)-4\cdot(-6)=-8+20+24=-8+44=44-8=\boxed{36}\\\\e] \ \frac{7+(-15)}{-2}+\frac{-8}{-3-1}=\frac{7-15}{-2}+\frac{-8}{-4}=\frac{-8}{-2}+2=4+2=\boxed6\\\\f] \ \frac{-11-9}{-4}-\frac{6-12}{-3}=\frac{-20}{-4}-\frac{-6}{-3}=5-2=\boxed3[/tex]
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