1.已知1/3x+2x-2/3>x/2+4/3,化简I3x-5I-I3x+5I-I5-3xI

问题描述:

1.已知1/3x+2x-2/3>x/2+4/3,化简I3x-5I-I3x+5I-I5-3xI

∵1/3x+2x-2/3>x/2+4/3 ==>7x/3-2/3>x/2+4/3
==>14x-4>3x+8
==>11x>12
==>x>12/11
∴x>12/11 ==>3x+5>0
∵对任意x,│3x-5│与│5-3x│互为相反数,或等于零
∴│3x-5│-│3x+5│-│5-3x│=-│3x+5│
=-(3x+5).