(16-y²)½-(9-y²)½=5,求y
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(16-y²)½-(9-y²)½=52(16-y²)½-(9-y²)½=102(16-y²)½=10+(9-y²)½2(16-y²)½=10+3(3-y²)½2(16-y²)½=10+3√(3-y²)2√(16-y²)=10+3√(3-y²)2√(16-y²)-3√(3-y²)=10(2√(16-y²)-3√(3-y²))²=1024(16-y²)-6√(16-y²)(3-y²)+9(3-y²)=1004(16-y²)-6(48-6y²+y⁴)+27-9y²=100y⁴-15y²+36=0y²=3±√7y=±√(3+√7)
咨询记录 · 回答于2023-02-16
(16-y²)½-(9-y²)½=5,求y
好的,谢谢
我想用平方差公式,不知如何操作?
(16-y²)½-(9-y²)½=52(16-y²)½-(9-y²)½=102(16-y²)½=10+(9-y²)½2(16-y²)½=10+3(3-y²)½2(16-y²)½=10+3√(3-y²)2√(16-y²)=10+3√(3-y²)2√(16-y²)-3√(3-y²)=10(2√(16-y²)-3√(3-y²))²=1024(16-y²)-6√(16-y²)(3-y²)+9(3-y²)=1004(16-y²)-6(48-6y²+y⁴)+27-9y²=100y⁴-15y²+36=0y²=3±√7y=±√(3+√7)
另一个?
就是第一个道题,因为我看到您的解题过程,我想应该是我写的让您误解了
嗯,我是在想,能否采用平方差公式,谢谢您
可以去试试