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a). x² + y³
b). 2 * x * (a + b)
2.
a). 16a + 61ab - 6a - 84ab = 10a - 23ab
b). 10ab - 5ab2 - 6a2b + 10ab2 + 16ab = 26ab + 5ab2 - 6a2b
3.
-(3y + 6) - (2x + y - 10) - 2y = -3y - 6 - 2x - y + 10 - 2y = -6y - 2x + 4 = 12 - 6 + 4 = 10