Question

已知丨3a+4丨+丨4b+3丨=-丨c+1丨,求a-b+c的相反数

Answer 1

|3a+4|+|4b+3|+|c+1|=0,

3a+4=4b+3=c+1=0,

a=-4/3,b=-3/4,c=-1,

a-b+c=-4/3+3/4-1=-19/12,

-(a-b+c)=19/12.