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2) a*b*c=(-30)*5*(-4)= (-150)*(-4)=600

(-b)*c=(-5)*(-4)=20

- a*(-c)= - (-30)* (- -4)=30*4=120

3) a/b*c=-400/5*(-8)= -80*(-8)=640

-a/b/c= -(-400)/5/(-8)=80/(-8)= -10

-a/(b/c)= - (-400)/(5/(-8))= 400/(-0.625)= -640

4) a +a²+a³,Если а = $-\frac{1}{3} +(-\frac{1}{3} )^{2} +(-\frac{1}{3} )^{3}= -\frac{1}{3} + \frac{1}{9} - \frac{1}{27} = \frac{-9+3-1}{27} = - \frac{7}{27}$

с⁵-с³-с = $(-\frac{1}{2})^{5} - (-\frac{1}{2} )^{3} - (-\frac{1}{2} )= -\frac{1}{32} + \frac{1}{8} +\frac{1}{2} = \frac{-1+4+16}{32} = \frac{19}{32}$

5) (a-b)/c=(0.8-(-5))/0.1=5.8/0.1=58

(a*c)/b=0.8*0.1/(-5)=0.08/(-5)= -0.016

c/(a*b)=0.1/(0.8* (-5))=0.1/ (-4)= -0.025