Answer:
(a) \[-x{{y}^{2}},2x{{y}^{2}};-4y{{x}^{2}},20{{x}^{2}}y;8{{x}^{2}},-11{{x}^{2}},-6{{x}^{2}};\]\[7y,y;-100x,3x;-11yx,2xy\] (b) \[10pq,-7qp,78qp;7p,2405p;8q,-100q;\]\[-23,41;12{{q}^{2}}{{p}^{2}},-{{p}^{2}}{{q}^{2}};-5{{p}^{2}},701{{p}^{2}};13{{p}^{2}}q,q{{p}^{2}}\]
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