x1 x2是方程3x2-7x+2=0两根求x1+x2
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x1 x2是方程3x2-7x+2=0两根求x1+x2
x1 x2是方程3x2-7x+2=0两根求x1+x2
x1 x2是方程3x2-7x+2=0两根求x1+x2
3x²-7x+2=0
)3x-1)(x-2)=0
x1=1/3,x2=2
所以x1+x2=7/3
x1 x2是方程3x²-7x+2=0两根
那么由韦达定理有x1+x2=7/3
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易知x1+x2=7/3,x1x2=2/3,所以(X1+2)(X2+2)=28/3
Ⅰx1^2-x^2Ⅰ=(x1+x^2)^2-2x1x2=49/9-4/3=37/9