-x^2-2x+15<0的解集是
问题描述:
-x^2-2x+15<0的解集是
答
X3
x^2+2X-15>0
(x+5)*(x-3)>0
-x^2-2x+15<0的解集是
X3
x^2+2X-15>0
(x+5)*(x-3)>0