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b.- tiga m - tiga mn
c.tiga a pngkt 2 -5ab + 11
d.x pngkt 2 +xy - tiga y
e.10 p pngkt 2 - 11pq +5
f.7kl-2tiga mn
=5p+5
b.9m-12m+4mn-7mn
=-3-3
c.2a²-5a²+3ab+2ab-7-4
=-3+5ab-11
d.-3xy+2xy+7y-4y+4²
=1xy+3y+4²
e.-4p²-6p²+3pd+8pd-2-3
=-10p²+11pd-5
f.12kl-5kl-20mn-3mn
=7kl-23mn