解不等式(高二)1/(x+1) +2/(x+3)
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解不等式(高二)1/(x+1) +2/(x+3)
解不等式(高二)
1/(x+1) +2/(x+3)
解不等式(高二)1/(x+1) +2/(x+3)
通分 (x+3)+2(x+1)/(x+1)(x+3)
(X+3)(x+2)+2(x+1)(x+2)<3(x+1)(x+3)
X方+5X+6+2X方+6X+4<3X方+12X+9
X>1
(x-1)除以(x+1)(x+2)(x+3)>0
x=-3 -2 -1 1
穿根
x<-3 -2