1. Add the following algebraic expressions:
(i) 3a<sup>2</sup>b, -4a<sup>2</sup>b, 9a<sup>2</sup>b
(ii) 2/3a, 3/5a, -6/5a
(iii) 4xy<sup>2</sup> – 7x<sup>2</sup>y, 12x<sup>2</sup>y -6xy<sup>2</sup>, -3x<sup>2</sup>y + 5xy<sup>2</sup>
1. Add the following algebraic expressions:
(i) 3a<sup>2</sup>b, -4a<sup>2</sup>b, 9a<sup>2</sup>b
(ii) 2/3a, 3/5a, -6/5a
(iii) 4xy<sup>2</sup> – 7x<sup>2</sup>y, 12x<sup>2</sup>y -6xy<sup>2</sup>, -3x<sup>2</sup>y + 5xy<sup>2</sup>