x1+x2= -1
x1*x2= -2
a) 1/x1+ 1/x2= (x1+x2)/x1*x2= -1/-2= 0,5
б) x1²+x2²= (x1+x2)²-2x1x2= (-1)²-2*(-2)= 1+4= 5
в) (x1²+x2²)/x1*x2= 5/-2= -2,5
г) (x1²+x2²)/(x1x2)²= 5/(-2)²= 5/4= 1,25
д) x1³+x2³= (x1+x2)(x1-x1x2+x2)= (-1)*(-1-(-2))= -1*1= -1
е) (x1³+x2³)/(x1x2)³= -1/(-2)³= -1/-8= 0,125
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x1+x2= -1
x1*x2= -2
a) 1/x1+ 1/x2= (x1+x2)/x1*x2= -1/-2= 0,5
б) x1²+x2²= (x1+x2)²-2x1x2= (-1)²-2*(-2)= 1+4= 5
в) (x1²+x2²)/x1*x2= 5/-2= -2,5
г) (x1²+x2²)/(x1x2)²= 5/(-2)²= 5/4= 1,25
д) x1³+x2³= (x1+x2)(x1-x1x2+x2)= (-1)*(-1-(-2))= -1*1= -1
е) (x1³+x2³)/(x1x2)³= -1/(-2)³= -1/-8= 0,125