根据题意:a+b=0,cd=1,所以:
x=-(a-2b)-3(1-a)=-a+2b-3+3a=2a+2b-3=2(a+b)-3=-3;
y=c^2*d-c+1=c*(cd)-c+1=c-c+1=1
(2x+y)/3-(3x-2y)/6
=(4x+2y-3x+2y)/6
=(x+4y)/6
=(-3+4)/6
=1/6
根据题意:a+b=0,cd=1,所以:
x=-(a-2b)-3(1-a)=-a+2b-3+3a=2a+2b-3=2(a+b)-3=-3;
y=c^2*d-c+1=c*(cd)-c+1=c-c+1=1
(2x+y)/3-(3x-2y)/6
=(4x+2y-3x+2y)/6
=(x+4y)/6
=(-3+4)/6
=1/6