(X-1)X(X+1)(X+2)+1把步骤写出来可以让人理解就OK了,谢!
热心网友
(X-1)X(X+1)(X+2)+1=[X(X+1)][(X+2)(X-1)]+1=(X^2+X)(X^2+X-2)+1=[ 设: Y=X^2+X ]Y^2-2Y+1=(Y-1)^2=(X^2+X-1)^2
(X-1)X(X+1)(X+2)+1把步骤写出来可以让人理解就OK了,谢!
(X-1)X(X+1)(X+2)+1=[X(X+1)][(X+2)(X-1)]+1=(X^2+X)(X^2+X-2)+1=[ 设: Y=X^2+X ]Y^2-2Y+1=(Y-1)^2=(X^2+X-1)^2