X(X-1)大于或等于(X+3)(X-3)这道题怎没解?急
问题描述:
X(X-1)大于或等于(X+3)(X-3)这道题怎没解?急
答
X(x-1)>=(x+3)(x-3)
X2-x>=x2-9
-x>=-9
X