0.17.
1) (x-2)(x+3)+(x-3)(x+2)
3) (a+1)(a+2)+(a+3)(a+4);
2) (y-1)(y+2)+(y+1)(y-2);
4) (c-1)(c-2)+(c-3)(c-4).
Прошу помогите до завтра​
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