已知X1 X2 是方程X²-2X+a=0的两个实数根,且X1+2X2(二倍的X2)+a=3-根号二(1)求X1 X2及a的值(2)求X1³-3X1²+2X1+X2的值
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![已知X1 X2 是方程X²-2X+a=0的两个实数根,且X1+2X2(二倍的X2)+a=3-根号二(1)求X1 X2及a的值(2)求X1³-3X1²+2X1+X2的值](/uploads/image/z/1654228-28-8.jpg?t=%E5%B7%B2%E7%9F%A5X1+X2+%E6%98%AF%E6%96%B9%E7%A8%8BX%26%23178%3B-2X%2Ba%3D0%E7%9A%84%E4%B8%A4%E4%B8%AA%E5%AE%9E%E6%95%B0%E6%A0%B9%2C%E4%B8%94X1%2B2X2%EF%BC%88%E4%BA%8C%E5%80%8D%E7%9A%84X2%EF%BC%89%2Ba%3D3-%E6%A0%B9%E5%8F%B7%E4%BA%8C%EF%BC%881%EF%BC%89%E6%B1%82X1+X2%E5%8F%8Aa%E7%9A%84%E5%80%BC%EF%BC%882%EF%BC%89%E6%B1%82X1%26%23179%3B-3X1%26%23178%3B%2B2X1%2BX2%E7%9A%84%E5%80%BC)
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已知X1 X2 是方程X²-2X+a=0的两个实数根,且X1+2X2(二倍的X2)+a=3-根号二(1)求X1 X2及a的值(2)求X1³-3X1²+2X1+X2的值
已知X1 X2 是方程X²-2X+a=0的两个实数根,且X1+2X2(二倍的X2)+a=3-根号二
(1)求X1 X2及a的值
(2)求X1³-3X1²+2X1+X2的值
已知X1 X2 是方程X²-2X+a=0的两个实数根,且X1+2X2(二倍的X2)+a=3-根号二(1)求X1 X2及a的值(2)求X1³-3X1²+2X1+X2的值
将x1,x2代入方程,联立得一个三元三次方程组,可解出x1,x2,a的值
将x1,x2代入方程,联立得一个三元三次方程组,可解出x1,x2,a的值
X1+2X2=(-b/a)(不是你题中的那个a)=-(-2/1)=2