求解,高一数学题
3个回答
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(1)
f(x) = ax^2+bx+c
a>b>c
f(1)=0
a+b+c=0
b= -(a+c)
f(x)=0
ax^2+bx+c=0
△
=b^2-4ac
=(a+c)^2 -4ac
=(a-c)^2
>0
f(x)=0 有2个相异实数根
(2)
x1+x2 = -b/a
x1.x2 = c/a
2个交点的距离=d
d^2
= (x1-x2)^2
= (x1+x2)^2 -4x1.x2
=b^2/a^2 - 4c/a
=(b^2-4ac)/a^2
=(a-c)^2/a^2
d = (a-c)/a
=1 - c/a
d>1
f(x) = ax^2+bx+c
a>b>c
f(1)=0
a+b+c=0
b= -(a+c)
f(x)=0
ax^2+bx+c=0
△
=b^2-4ac
=(a+c)^2 -4ac
=(a-c)^2
>0
f(x)=0 有2个相异实数根
(2)
x1+x2 = -b/a
x1.x2 = c/a
2个交点的距离=d
d^2
= (x1-x2)^2
= (x1+x2)^2 -4x1.x2
=b^2/a^2 - 4c/a
=(b^2-4ac)/a^2
=(a-c)^2/a^2
d = (a-c)/a
=1 - c/a
d>1
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