5（a+b）²-3(2a+3b)-3(a+b)²+(2a+3b)
=5(a+b)^2-6a-9b-3(a+b)^2+2a+3b
=2 (-2 a + a^2 - 3 b + 2 a b + b^2)
(x-6)²+|y+1|=0,
x=6
y=-1
﹙﹣x+2y/3﹚-2/3（x+1/2y）
=(-6-2/3)-2/3(6-1/2)
=-(31/3)
一.化简.5（a+b）²-3(2a+3b)-3(a+b)²+(2a+3b)
5（a+b）²-3(2a+3b)-3(a+b)²+(2a+3b)
=5(a+b)^2-6a-9b-3(a+b)^2+2a+3b
=2 (-2 a + a^2 - 3 b + 2 a b + b^2)
(x-6)²+|y+1|=0,
x=6
y=-1
﹙﹣x+2y/3﹚-2/3（x+1/2y）
=(-6-2/3)-2/3(6-1/2)
=-(31/3)