来自曲伸的问题
-2x^+xy+y^-6x-y-2^这个符号相当于平方打错了……6x应该改为5x
-2x^+xy+y^-6x-y-2
^这个符号相当于平方
打错了……6x应该改为5x
1回答
2020-04-10 14:42
-2x^+xy+y^-6x-y-2^这个符号相当于平方打错了……6x应该改为5x
-2x^+xy+y^-6x-y-2
^这个符号相当于平方
打错了……6x应该改为5x
-2x^+xy+y^-5x-y-2
=-[2x^-xy-y^+5x+y+2]
=-[(2x+y)(x-y)+5x+y+2]
=-[(2x+y)(x-y)+2*(2x+y)+(x-y+2)]
=-[(2x+y)(x-y+2)+(x-y+2)]
=-(2x+y+1)(x-y+2)