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b) (-5x²) × (2z²) × 5
= (-10x²z²) × 5
= (-50x²z²)
c) 4p³q² : 2p²q²
= 2p
d) (-3a^6b³c^5) : (-a³bc²)
= 3a³b²c³
e) (-2x²)^5 = (-32x^10)
f) (4pq²r³)² = 16p²q^4r^6