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2. (-2p.q^-1) x -q^4 x (2/5) p^2 = (4/5) p^3.q^3
3. y^5 x (x.y)^3 x (x^-2.y^-1) = y^5. y^3.y^-1. x^3 .x^-2 = y^7 x
4. (abc)^4 . (3 . b^-3.c^-3) .(b^3 .a^5)(1/27)= (1/9) a^-1 .b^4.c
5. (-5)^3 x ( 5^-2 x 3^-2) x (5^4 x 2^4 x 3^-4) x (3^2)^5x 5^-5
= (5^3 . 5^-2 . 5^4 . 5^-5 )( 3^-2 . 3^-4 . 3^10)( 2^4)
= 3^4 x 2^4 = 81 x 16 = 1296