Question

已知A+B>0,A+2B0;(2)当B取何值时,|A+B|+|A+2B|=0;(3)当B取何值时,|A+B|+|A+2B

Answer 1

当B为任意实数时,|A+B|+|A+2B|>0.当A,B=0时时,|A+B|+|A+2B|=0.|A+B|+|A+2B|