4-x^2≦0 4≦x^2x≥2或x≤-2 2x^2-7x-15<0(x-5)(2x+3)<0-3/2 综上2≤x<5
4-x^2≦0x>=2或者x<=-22x^2-7x-15<0(2X+3)(X-5)<0-3/2则不等式组的解集为[2,5)
解:①得,x≤-2或者x≥2②得,-3/2∴不等式组的解集是2≤x<5