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2. 3^7 x 7^3 x 2/ 42^3 = 3^7 x 7^3 x 2 / (2 x 7 x 3) ^3
= 3^7x7^3x2/2^3x7^3x3^3 = 3^4/2 = 81/4
3. 2x^3 . 7x^4 . 9x^2 = 126x^9
4. -2p/q.-q^4.2/5p^2 = -2p/q. q^4 . 2/5p^2
= -2p x q^3 x 2/5p^2
= -4/5p^3 x q^3
5. -16/81 x 1/3^2 = -16/81 . 1/9 = -16/3^6 = -2^4/3^6
6. -125 x 1/225 x 10.000/81 . 59049/3125 = -1296