Sagot :
a)
-2/3 5
3x+2 - 0 + +
x-5 - - 0 +
(3x+2)/(x-5) + - +
solution: ]-oo ; -2/3]U]5 ; +oo[
b)
-1/2 4/7
4-7x + + 0 -
2x+1 - 0 + +
(4-7x)/(2x+1) - + 0 -
solution: ]-1/2 4/7]