(x²-4x+3)/(x²-49)≥0x²-4x+3=0x1+x2=4 U x1*x2=3⇒x1=1 U x2=3x²-49=0x²=49x=+-7 + _ + _ +---------------(-7)--------------[1]-----------------[3]-------------------(7)----------------x∈(-∞;-7) U [1;3] U (7;∞){x²+x-2≥0{(x+3)/(x-4)≤01)x1+x2=-1 U x1*x2=-2⇒x1=-2 U x2=1x≤-2 U x≥12)x=-3 x=4-3≤x<4x∈[-3;-2] U [1;4)