A)
6x²-29x+30≤0 6x²-29x+30≤0
5x+2≥3x² ⇔ 3x²-5x-2≤0
6x²-29x+30=0
x1=[29-√(29²-4·6·30)]/12=[29-11]/12=3/2 x2=[29+11]/12=10/3
+ - +
----------------[3/2]///////////[10/3]----------------
3x²-5x-2=0
x1=[5-√(25+24)]/6=[29-11]/12=-1/3 x2=[5+7]/63=2
+ - +
------[-1/3]////////////////[2]----------------
x∈[3/2;2]