解不等式(高二)1/(x+1) +2/(x+3)
问题描述:
解不等式(高二)
1/(x+1) +2/(x+3)
答
(x-1)除以(x+1)(x+2)(x+3)>0
x=-3 -2 -1 1
穿根
x1
答
(X+3)(x+2)+2(x+1)(x+2)X方+5X+6+2X方+6X+4X>1
答
通分 (x+3)+2(x+1)/(x+1)(x+3)