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= (4b^7/a²)(16b^4a²/4a^6)
= 64b^11/4a^6
= 16b^11
a^6
2. [(-p)³×(-4)²×r³/-3(p²q)³] ÷ [2pqr³/-12(qr)²] = (-16p³r³/-3p^6q³)
(2pqr³/-12q²r²)
= 16p³r³ x 6q²r²
3p^6q³ -pqr³
= 96p³q²r^5
-3p^7q^4r³
= 32r²
p^4q²