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B.84a5÷7a²=12a³
C.63x7y4z²÷9x³y²z²=7x³y²
D.27k6m5n4÷3k²m³n÷9k³mn²=9k4m²n³÷9k³mn²=kmn
E.48p5q8r6÷(-6p²q³r³)÷4pq²r²=(-8p³q5r3)÷4pq²r²=(-2pq³r)
-2pq³r