晕 好简单哦x.x+2x+1=0(x+1)(x+1)=0所以 x=-1
x.x+2x+1=03x+0.1*x+1=03.1x=-1x=-10/31不可能啊x=-1
什么是x.x?是x的平方的话(x+1)的平方=0x=-1
x.x+2x+1=0(x+1)^2=0x=-1
x.x+2x+1=0 (x+1)^2=0 x=-1呵呵
x.x+2x+1=0X+X/10+2X+1=03X+X/10+1=0X=10/31