1. 2a²b(6a²b+8a²b+9ab²)
2. 12mx(-2mx+4m²x² - 7m³n³)
3. 8s² -7m +4
x 4s-7
4.3m²-7m+4
x 3m²-2m -- 7
5.28m⁵x⁵ -- 44m⁶x⁶ -- 12m⁴x³
-4m³x²
6.-54r³st³+90r²s¹⁹t⁷-36r²s²t
18rst
divide number 5 and 6
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