a) 18x5​−6x4​​+3x​​​−4x4​​+2x5​−3x​​​+8−10x5​=
   =10x5−10x4+8
b) −4x2y​−8xy2​​+2xy​​​−6x2y​+9xy2​​−8x2+9y2−xy​​=
   =−10x2y+xy2+xy−8x2+9y2
c) 21​km​−43​m2​​−2,5km​+0,75m2​​−9k2​​​+6m−3k2​​​=
   =−2km−12k2+6m
d) −pr​+pq​​−pqr​​​−pr​−qr​​​​+pq​​−pqr​​​+qr​​​​=
   =−2pr+2pq−2pqr
e) 9x3y​+4xy2​​−5x3y​+7xy2​​−4x3y​−11xy2​​=0
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