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
a.imaginary
b.real,rational,and equal
c.real,irration,and unequal
d.real,rational,and unequal
问题解答:
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