问题
填空题
计算:
(1)(-a+3)2=______;
(2)(-a-3)2=______.
答案
(1)(-a+3)2
=(-a)2-2•a•3+32
=a2-6a+9.
故答案为:a2-6a+9.
(2)(-a-3)2
=(-a)2+2•(-a)•(-3)+(-3)2
=a2+6a+9.
故答案为:a2+6a+9.
计算:
(1)(-a+3)2=______;
(2)(-a-3)2=______.
(1)(-a+3)2
=(-a)2-2•a•3+32
=a2-6a+9.
故答案为:a2-6a+9.
(2)(-a-3)2
=(-a)2+2•(-a)•(-3)+(-3)2
=a2+6a+9.
故答案为:a2+6a+9.