数学题(x+y-z)(x-y+z)=(A+B)(A-B),且A=X则B=?
问题描述:
数学题(x+y-z)(x-y+z)=(A+B)(A-B),且A=X则B=?
答
(x+y-z)(x-y+z)=(A+B)(A-B)
[x+(y-z)][x-()]=(A+B)(A-B)
A=X
B=(y-z)