19-ից 24-ը

19) (4b³-3b²+7b-10)(-2b⁵)=-8b⁸+6b⁷-14b⁶+20b⁵

20) (3c⁸+5c⁵-2c³-8c+3)*3c⁴=9c¹²+15c⁹-6c⁷-24c⁵+9c⁴

21) 5xy(2x²-3xy²+y³-4x)=10x³y-15x²y³+5xy⁴-20x²y

22) (-2a³b²)*(-6a²-7ab+b³-3a³b⁴+2b²)=12a⁵b²+14a⁴b³-2a³b⁵+6a⁶b⁶-4a³b⁴

23) (8a³-4a²b⁴-3ab²+5b³)*(-2a⁵b³)=-16a⁸b³+8a⁷b⁷+6a⁶b⁵-10a⁵b⁶

24) (-2xyz)*(4xy⁵z-5x³yz²+3xy²-2y³z²)=-8x²y⁶z²+10x⁴y²z³-6x²y³z+4xy⁴z³