30 баллов.
Найти сумму многочленов.
1) (2x+y-z)+(x+2y-2z)=
2) (12x^2-y^3+x)+(x+y^3-10x^2)=
3) (15m^3+n^2-m)+(2m-n^2-5m^3)=​
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