(5.5-3√2)a^2+(9-3√2)a+3.5 - 知识问答

(5.5-3√2)a^2+(9-3√2)a+3.5=0有一解为a=-1,那另一解为多少?

1个回答

韦达定理
x1x2=3.5/(5.5-3√2)
=3.5(5.5+3√2)/(5.5²-3²*2)
=3.5(5.5+3√2)/3.5²
=(5.5+3√2)/3.5
x1=-1
所以另一解是-(5.5+3√2)/3.5

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