a=根号3-2b=根号3+2.则,2a方-2ab+b方+4a+4=
问题描述:
a=根号3-2b=根号3+2.则,2a方-2ab+b方+4a+4=
答
解由题知a-b=-4,a+2=√3
2a方-2ab+b方+4a+4
=a方-2ab+b方+a^2+4a+4=
=(a-b)方+(a+2)方
=(-4)^2+(√3)方
=16+3
=19