一元二次方程x²-5x+m=0的两根为x1,x2,并且(x1)²-(x2)²=15,求m
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一元二次方程x²-5x+m=0的两根为x1,x2,并且(x1)²-(x2)²=15,求m
一元二次方程x²-5x+m=0的两根为x1,x2,并且(x1)²-(x2)²=15,求m
一元二次方程x²-5x+m=0的两根为x1,x2,并且(x1)²-(x2)²=15,求m
根据韦达定理
x1+x2=5
∵x1²-x2²=15
∴x1-x2=3
∴x1=4,x2=1
m=x1*x2=4
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