4(x+2)2-9(x-3)2=0 [2(x+2)+3(x-3)][2(x+2)-3(x-3)]=0.这一步是怎么得来的、?-3-Thanks、、
问题描述:
4(x+2)2-9(x-3)2=0
[2(x+2)+3(x-3)][2(x+2)-3(x-3)]=0.这一步是怎么得来的、?
-3-
Thanks、、
答
4(x+2)2-9(x-3)2=0
[2(x+2)+3(x-3)][2(x+2)-3(x-3)]=0.这一步是怎么得来的、?
-3-
Thanks、、