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= 2x^3 . 7x^4 . 9x^2
= 126x^9
2) (-2p/q) (-q)^4.2/5 p^2
= -4/5.p^3.q^3
3) 1/x^2y . 2x/3y^2 . 5/3x . (4y)^2
= 1/x^2y . 2x/3y^2 . 5/3x . 16y^2
= 160/9x^2y
4) 3x^2y^3/24x . (2y)^2
= 1/2 . xy^5
= 1/2.2.3^5
= 3^5
= 243
5) 3p^2.(-3)^4.4(q)^2 / (-2p)^2(-3q)^2.q^2
= 27/p