—2x²+xy,—5x²+2xy and 4x²—7xy
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Aɴsᴡᴇʀ
Simplifying the given expressions, we have
(i) 7x3y + 9yx3 = (7 + 9)x3y = 16x3y
(ii) 12a2b + 3ba2 = (12 + 3)a2b = 15a2b
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