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数学
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a的平方减3怎样因式分解
还有,4y的平方-7.
人气:303 ℃ 时间:2019-12-17 15:06:30
解答
解
a²-3
=a²-(√3)²
=(a+√3)(a-√3)
用平方差
(a+b)(a-b)=a²-b²
4y²-7
=(2y)²-(√7)²
=(2y+√7)(2y-√7)
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