Ответ:
1) (-5х^2-4) +(8х^2-6) =-5х^2-4+8х^2-6=3х^2-10
2) (2х+16) +(-х²-6х-20) =2х+16-х²-6х-20= -х^2-4х-4
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Ответ:
1) (-5х^2-4) +(8х^2-6) =-5х^2-4+8х^2-6=3х^2-10
2) (2х+16) +(-х²-6х-20) =2х+16-х²-6х-20= -х^2-4х-4