已知a+b=3,a^2b+ab^2=-30,则a^2-ab+b^2+11

2024-12-14 04:38:03
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回答1:

a²b + ab² = -30
ab(a + b) = -30
3ab = -30
ab = -10

a² - ab + b² + 11
= (a + b)² - 3ab + 11
= 3² - 3×(-10) + 11
= 9 + 30 + 11
= 50