Найдите сумму многочленов:
1)m+n и m-n
2)a^2+2ab+b^2 и a^2-2ab+b^2
3)a^2+2ab+b^2 и -a^2+2ab-b^2
4)5x^2-5x+4 и -4x^2+5x-4

Найдите разность многочленов:
1)a^2-a+1 и a+1
2)x^2+xy+y^2 и x^2-xy+y^2
3)3x+7y и 2x-5y
4)8a+9b-10c и 9a-10b+11c
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