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