the roots of the equation x2-7x+15=0,

问题描述:

the roots of the equation x2-7x+15=0,
a.imaginary
b.real,rational,and equal
c.real,irration,and unequal
d.real,rational,and unequal
1个回答 分类:数学 2014-10-16

问题解答:

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答:
A
b^2-4ac=(-7)^2-4*15=-11
 
 
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