найдите алгебраическую сумму многочленов 12.3. 1) (4х +8y) + (23х + 5у);
2) (83а - 91b) - (89а - 100b);
3) (1,5т - 4,2n) - (2т + 3n); 4) (5k + 6t) + (2,8t – 3,1k);
3
7
13
5)
20b +11b а; 6) а + 53d + 60d
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