从历史的发展来看,早在公元3世纪,丢番图在《算术》中就遇到了二次方程无解的问题.此后的数学家都一致认为,当根的判别式小于零时方程无解.复数历史的真正开端是在16世纪,意大利数学家卡丹在解决著名问题“将10分成两部分,使它们的乘积等于40”时,首次给出了形如5+(?)和5-(?)的两个解,但他认为这是“不可能”的情形.随 Judging from the historical development, as early as the 3rd century AD, Diophagu was experiencing the problem of non-solution of quadratic equation in “arithmetic.” Since then, all mathematicians agree that when the discriminant of root is less than zero, the equation Solution. The real beginning of plural history was the first time in the 16th century when the Italian mathematician Cardin solved the well-known question “dividing 10 into two, making their product equal to 40” And 5- (?) Two solutions, but he thinks it is “impossible ” situation