计算:3a2-[a2+(5a2-2a)-2(a2-3a)].
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计算:3a2-[a2+(5a2-2a)-2(a2-3a)].
![计算:3a2-[a2+(5a2-2a)-2(a2-3a)].](/uploads/image/z/17204211-27-1.jpg?t=%E8%AE%A1%E7%AE%97%EF%BC%9A3a2-%5Ba2%2B%EF%BC%885a2-2a%EF%BC%89-2%EF%BC%88a2-3a%EF%BC%89%5D%EF%BC%8E)
3a2-[a2+(5a2-2a)-2(a2-3a)]
=3a2-(a2+5a2-2a-2a2+6a),
=3a2-(4a2+4a),
=3a2-4a2-4a,
=-a2-4a.
=3a2-(a2+5a2-2a-2a2+6a),
=3a2-(4a2+4a),
=3a2-4a2-4a,
=-a2-4a.
化简:5a2-[a2+(5a2-2a)-2(a2-3a)].
计算:(3a2+2a+1)-(2a2+3a-5)的结果是( )
(a2-4/a2-4a+3)×(a-3/a2+3a+2=?
(a2+5a+3)(a2+5a-2)-6因式分解
计算a2-(a-3)2,正确的结果是( )
(4a2-3a+1)-3(-a3+2a2).
已知a2-3a+1=0,那么4a2−9a−2+91+a2=( )
先化简再求值:5a2+3b2+2(a2-b2)-(5a2-3b2),其中a=-1,b=12.
若根号(a2-3a+1)+b2+2b+1,则a2+1/a2-绝对值b=是多少
比较a2-3a+1和a2+2a-5的大小.(作差法比大小)
2a-3b/b2-a2 -a+3b/a2-b2 +a+2b/a2-b2
先化简,再求值:(4a2-3a)+(2+4a-a2)-(2a2+a-1),其中a=-2.