已知ab互为相反数,cd互为倒数,x=3(a-5/3b)-2(4a-1),y=c的二次方×d-d二次方-(5-d/c+c）,求2x-y/3-3x+2y/6的值
a+b=0
cd=1
x=3(a-5/3b)-2(4a-1)=-5a-5b+2=2
y=c的二次方×d-d二次方-(5-d/c+c）=c-d二次方-5+d二次方-c=-5
2x-y/3-3x+2y/6
=4+5/3-6-5/3
=-2