X^2-1=0 .X^2 = 1.x1 = 1,x2 = -1
X^2+X-2=0 .(X+2)(X-1)=0.X1 = 1,X2 = -2
X^2+2X-3=0 .(X +3)(X-1)=0.X1 = 1,X2 = -3
.
X^2+(N-1)X-N=0.(X+N)(X-1)=0.X1 = 1,X2 = -N
这N个方程的根具有什么共同特点:都有一个要为1.
X^2-1=0 .X^2 = 1.x1 = 1,x2 = -1
X^2+X-2=0 .(X+2)(X-1)=0.X1 = 1,X2 = -2
X^2+2X-3=0 .(X +3)(X-1)=0.X1 = 1,X2 = -3
.
X^2+(N-1)X-N=0.(X+N)(X-1)=0.X1 = 1,X2 = -N
这N个方程的根具有什么共同特点:都有一个要为1.