k, ( 7^5 + 7^9 ) x ( 5^4 x 5^6 ) x ( 3^3 x 3 - 9^2 )
= ( A ) x ( B ) x ( 3^4 - 81 )
= A x B x ( 81 - 81 )
= A x B x 0
= 0
i, [ ( 5^2 x 5^3 ) - 7^2 x 2 ) : 2 ] x 6 - 7 x 2^5
= [ ( 5^5 - 49 x 2 ) : 2 ] x 6 - 7 x 32
= [ ( 3125 - 98 ) : 2 ] x 6 - 224
= [ 3027 : 2 ] x 6 - 224
= 1513,5 x 6 - 224
= 9081 - 224 = 8857