11.solve in |R:
(a) (2x+3)x/-x+1<or=0
(b) 2x-1/5x+3>0
12.solve in|R:
(a) x+5/x+7=4-x/5-x
(b) 24/x-3+24/x-3=6
13.solve in |R:
(a) 1/m-1 - 1/m+1=1/24
(b) k-5/k+1 + 2/k = 2/k(k+1)
14.solve in |R:
(a) 2m²+m=0
(b) t²-6t+5=0
15.solve in |R:
(a) 5-x-(1-3x)<2(x+1)-1
(b) 2t+3>or=2(t-5).
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