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:
12-12x+3x²-2x^4+4x²-x³+2x+5x²-10+4x²-x^4+16-4x²=
=-3x^4-x³+12x²-10x+18
Объяснение: