已知|2-x|与|x-y+4|互为相反数,求代数式3(x-y)-5(x-y)-3(x-y)+(y-x)-4(x+y)+3(y-x)的值

来源:学生作业帮助网 编辑:作业帮 时间:2024/05/04 22:42:04
已知|2-x|与|x-y+4|互为相反数,求代数式3(x-y)-5(x-y)-3(x-y)+(y-x)-4(x+y)+3(y-x)的值

已知|2-x|与|x-y+4|互为相反数,求代数式3(x-y)-5(x-y)-3(x-y)+(y-x)-4(x+y)+3(y-x)的值
已知|2-x|与|x-y+4|互为相反数,求代数式3(x-y)-5(x-y)-3(x-y)+(y-x)-4(x+y)+3(y-x)的值

已知|2-x|与|x-y+4|互为相反数,求代数式3(x-y)-5(x-y)-3(x-y)+(y-x)-4(x+y)+3(y-x)的值
|2-x|+|x-y+4|=0 2-x=0,x-y+4=0 x=2,2-y+4=0,y=6 3(x-y)-5(x-y)^2-3(x-y)+(y-x)^2+4(x+y)^2+3(y-x) =-4(x-y)^2+4(x+y)^2+3(y-x) =-4(x+y-x+y)(x+y+x-y)+3(y-x) =-16xy+3(y-x) =-192+12=-180