Даю 42 балла. упростите выражение: 1) P+Q,если Р=5а²+b,Q=-4a²-b
2) P-Q, если P=2p²-3q³, Q=2p²-4q³
3) A+B+C, если A = a² - b² + ab
B=2a²+3ab-5b², C = -4a² + 2ab - 3b²
4) A-B+C, если A=2a² - 3ab + 4ab²
B = 3a²+4ab-b², C = a²+2ab-3b²
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