Final answer:
In each set of terms, we can identify the like and unlike terms.
Step-by-step explanation:
In each set of terms, we need to identify the like and unlike terms.
(i) Like terms: 3a, 3b, and 7a. Unlike terms: 4a^2 and -5b.
(ii) Like terms: xy^2, yz^2, 3y^2x, and 4z^2y. Unlike terms: xy^2 and zx^2.
(iii) Like terms: abc, bca, ab^2c, and acb^2. Unlike terms: abc and cab.
(iv) Like terms: 3x^3y^3z^3 and -5x^3y^3z^3. Unlike terms: xyz, 12abc, and 4xyz.