解不等式
[2x-5]2<9
4x-10<9
4x<19
x<19/4
2. -3x²-4x+7<0
3x^2+4x-7>0
3(x^2+4/3 x+4/9)-4/3-7>0
3(x+2/3)^2>25/3
(x+2/3)^2>25/9
x+2/3>5/3 or x+2/3<-5/3
解得x>1 or x<-7/3.
（1）-3<2x-5<32<2x<8∴1(2)3x²+4x-7>0∴(x-1)(3x+7)>0∴x<-7/3或x>1
