绝对值和完全平方非负
x-1=0
x=1
x+2y+1=0
1+2y+1=0
y=-1
½x²ºº³y²º¹º＋y
=1/2×1×（-1）^2010-1
=1/2-1
=-1/2▏a－c－2▕＋﹙3a－6b－7﹚2＋▏3b＋3c－4▕＝0,求﹙﹣3ab﹚×﹙﹣a2c﹚×6ab2的值