Вправи: 266

266. Додай многочлени.

a) –3n³ + 3p² + (–3n³ + 3p² – 5) = –3n³ + 3p² – 3n³ + 3p² – 5 = –6n³ + 6p² – 5.

б) 3x²y³ + 5xy² – x²y² + (–3x²y² + 5xy² – 3x²y³) = 3x²y³ + 5xy² – x²y² – 3x²y² + 5xy² – 3x²y³ = –4x²y² + 10xy².