去括号:-2a2-[3a2-(a-2)]=______.
化简:5a2-[a2+(5a2-2a)-2(a2-3a)].
若3a2-a-2=0,则5+2a-6a2=______.
化简:a2-3ab+4b2-(2b2-3ab-3a2)=______.
(a2-4/a2-4a+3)×(a-3/a2+3a+2=?
若实数a满足a2-2a-1=0,则3a2-6a+5=______.
若实数a满足a2-2a=3,则3a2-6a-8的值为______.
若a2+2a=1,则2a2+4a-1=______.
若a2+a=0,则2a2+2a+2013=______.
若a2+a=0,则2a2+2a+2007的值为______.
已知a2+2a+1=0,则2a2+4a-3的值为______.
已知代数式a2-2a-3的值为0,那么代数式2a2-4a-5=______.
设三阶方阵A=(A1,A2,A3),且|A|=3,则|A1-A2,A3,2A1|=______