(2a+3b)(4a²-6ab+9b²)=8a³-12a²b+18ab²+12a²b-18ab²+27b³ = 8a³+27b³
(5-2a+a²)(4a²-3a-1)=20a²-15a-5-8a³+6a²+2a+4a⁴-3a³-a² = 4a⁴-11a³+25a²-13a-5
27.10)
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(2a+3b)(4a²-6ab+9b²)=8a³-12a²b+18ab²+12a²b-18ab²+27b³ = 8a³+27b³
(5-2a+a²)(4a²-3a-1)=20a²-15a-5-8a³+6a²+2a+4a⁴-3a³-a² = 4a⁴-11a³+25a²-13a-5
27.10)