13) (3a³-2b)*(3a³+2b)
14) (x-1)*(x+4)+(x-2)*(x+2)
15) 2x*(1+3x)-(5x+2)*(5x-2)=6x-19x²
14) (x-1)*(x+4)+(x-2)*(x+2)
15) 2x*(1+3x)-(5x+2)*(5x-2)=6x-19x²
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Ответ:
13)(3а^3)^2-(2b)^2=9a^6-4b^2
Ответ:
13) 9а6(степень) - 4b2
14) 2х2 + 3х - 8
15) 2х + 6х2 - 25х2 - 6х + 19х2 = 4
-4х = 4
х = -1
Объяснение: