¼X²-(m-2)X+m²=0
(1)Δ=(m-2)²-4(¼m²)=m²-4m+4-m²=4-4m=0
∴m=1,X1=X2=(m-2)/(¼)=-4
(2)X1²+X2²=224
∵X1、X2是此方程两根
∴X1+X2=(m-2)/(¼)=4(m-2)
X1·X2=1/¼=4
X1²+X2²=(X1+X2)²-2X1·X2
=16(m-2)²-8=224
(m-2)²=29/2
m=2±½根号58
∵m>0
∴m=2+½根号58
¼X²-(m-2)X+m²=0
(1)Δ=(m-2)²-4(¼m²)=m²-4m+4-m²=4-4m=0
∴m=1,X1=X2=(m-2)/(¼)=-4
(2)X1²+X2²=224
∵X1、X2是此方程两根
∴X1+X2=(m-2)/(¼)=4(m-2)
X1·X2=1/¼=4
X1²+X2²=(X1+X2)²-2X1·X2
=16(m-2)²-8=224
(m-2)²=29/2
m=2±½根号58
∵m>0
∴m=2+½根号58