Ответ:
а)(2-n)(1+2n)-(1+n)(3n-n³)=2+4n-n-2n²-3n+n³-3n²+n^4=n^4+n³-5n²+2
б) (3x+5)(9x²+15x+25)=27x³+45x²+75x+45x²+75x+125=27x³+90x²+150x+125
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Ответ:
а)(2-n)(1+2n)-(1+n)(3n-n³)=2+4n-n-2n²-3n+n³-3n²+n^4=n^4+n³-5n²+2
б) (3x+5)(9x²+15x+25)=27x³+45x²+75x+45x²+75x+125=27x³+90x²+150x+125