∵丨m-n-4丨≥0,(mn+1)²≥0又丨m-n-4丨+(mn+1)²=0∴丨m-n-4丨=0,(mn+1)²=0∴m-n-4=0, mn+1=0∴m-n=4 ①, mn= -1②,把(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的括号去掉,并且合并同类项,此式可整理为:3m-3n-6mn=3(m-n)-6mn再将①、②代入上式,可得(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)=3×4+6=18
相信我 肯定16