(x+1/2)2+(x−1/2)2+(x+1/2)(x−1/2).
问题描述:
(x+
)2+(x−1 2
)2+(x+1 2
)(x−1 2
). 1 2
答
原式=x2+x+
+x2-x+1 4
+x2-1 4
=3x2+1 4
.1 4