根号下[a²—(二分之a)²]等于多少?
问题描述:
根号下[a²—(二分之a)²]等于多少?
答
√a^2-(a/2)^2=√3/2*a
答
√[a²-(a/2)²]
=√(3a²/4)
= ± √3 a / 2
答
√[a²-(a/2)²]
=√(a²-a²/4)
=√(3a²/4)
=|a|/2×√3