СПРОСТІТЬ ВИРАЗИ:
1) (n+2)(n²-2n-3)-(n-3)(n²+3n+2);
2) (a+b-c)(a-b+c)-(a-b-c)(a+b+c);
3) x⁶(x⁷-(x⁸+x⁷(x²-x+1)))+x¹⁵.​
СРОЧНО!!!ДАЮ 15 БАЛІВ!​
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