已知3(2x+1)≥2(4x+1)+7,化简|x+3|-|3-x|

问题描述:

已知3(2x+1)≥2(4x+1)+7,化简|x+3|-|3-x|

3(2x+1)≥2(4x+1)+7 6x+3≥8x+2+7 6x+3≥8x+9 2x≤-6 x≤-3 |x+3|-|3-x| =3-x-(3-x) =3-x-3+x =0