2) а)5х^2-3х^2-х^2=х^2
b)7y^3+y^3+12y^3=20y^3
В)7а^b-5a^b+ab^2+2ab^2=2a^b+3ab^2
Г)z^3+2z^2+z^3-4z-z^2= 2z^3+z^2-4z
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2) а)5х^2-3х^2-х^2=х^2
b)7y^3+y^3+12y^3=20y^3
В)7а^b-5a^b+ab^2+2ab^2=2a^b+3ab^2
Г)z^3+2z^2+z^3-4z-z^2= 2z^3+z^2-4z