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2. (6-2y)(5y+3)=30y+18-10y²-6y
3. 3a²b³(2a⁴b-4a^7b^5=6a^6b^7-7a^9b^8
4.(2a-3b)(4a²-5ab³+a⁴b)=8a³-10a²b⁴+2a^5b-12a²b+15ab⁴-3a⁴b²
NB: Tanda ^ artinya pangkat..