6b2 – 7b + 3 и 7b2+4b – 2
1) сумма 6b² – 7b + 3 + (7b²+ 4b – 2) = 6b² – 7b + 3 + 7b² + 4b – 2 = 13b² - 3b + 1
1) разность 6b² – 7b + 3 - (7b²+ 4b – 2) = 6b² – 7b + 3 - 7b² - 4b + 2 = - b² - 11b + 5
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6b2 – 7b + 3 и 7b2+4b – 2
1) сумма 6b² – 7b + 3 + (7b²+ 4b – 2) = 6b² – 7b + 3 + 7b² + 4b – 2 = 13b² - 3b + 1
1) разность 6b² – 7b + 3 - (7b²+ 4b – 2) = 6b² – 7b + 3 - 7b² - 4b + 2 = - b² - 11b + 5