x方-x+1=0用十字相乘怎么答?maybe don't have answer

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x方-x+1=0用十字相乘怎么答?maybe don't have answer

x方-x+1=0用十字相乘怎么答?maybe don't have answer
x方-x+1=0用十字相乘怎么答?
maybe don't have answer

x方-x+1=0用十字相乘怎么答?maybe don't have answer
经计算,该题用十字相乘法解不出.
因为常数项1只能分解成-1乘-1或者1乘1
而它们的和:-1+-1不等于-1;1+1也不等于-1
所以最好用求根公式法计算.

根据根的判别式=b方-4ac=1-4=-3<0, 所以原方程无实根
因此用求根公式也没有实根,更何况十字相乘呢?

B平方-4AC小于0,所以无解。