1.4-3x>0 3x<4 解得x<4/32.3-x>=0且x-2不=0 解得x<=3且x不等以23.x-3>=0且x-2不等以0解得x>=34.-x^2>=0解得x=05.2x^2+1>=0 解得x属于有理数6.2x+3>=0且3-2x>=0解得-3/2<=x<=3/2
