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=10 b² x 2b
=20 b³
b) 1/4x (8x * 2r)
=1/4x * 16 xr
=4 x²r
c) 6p(2p*4q)
= 6p*8pq
= 48 p²q
d) (1/2a *6b)7b
= 3ab * 7b
= 21 ab²