1. Algebraic expression: x/3, a+b/ 15 Fraction: 1/n, 1/a+5, z/x2y, 2ab/(a+b)2.

2.( 1)2s 2-4st/s+2t(2) 1/x2-y2(3)2(4)U2+4 U2-4uU-2/U2-4 U2(5)9 x2/y6z 2(6)(x-y)3/(x+2y)3

3.( 1)6(2) 1/b(3)2 x2-4x+ 16/x2- 16(4)p2q 4-8r/ 16qr(5)x/ 1+x2(6) 1/a-b

4.( 1) No solution (2)X=-35/6

5.( 1)x≠2 and x ≠- 1/2 (2) x ≠ 2 and ≠3/2.

6.( 1)2 (2)>- 1/2 (3)