题:x=1.96 ,y=2.56求x-2√xy+y/√x-√y (me有个疑问请往下看)答案:x=1.96 ,y=2.56则√x=1.4,√y=1.6x-2√xy+y/√x-√y=(√x-√y)²/(√x-√y)=√x-√y=1.4-1.6=-0.2为什么2√xy在下一步就没了呢
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![题:x=1.96 ,y=2.56求x-2√xy+y/√x-√y (me有个疑问请往下看)答案:x=1.96 ,y=2.56则√x=1.4,√y=1.6x-2√xy+y/√x-√y=(√x-√y)²/(√x-√y)=√x-√y=1.4-1.6=-0.2为什么2√xy在下一步就没了呢](/uploads/image/z/13426690-58-0.jpg?t=%E9%A2%98%EF%BC%9Ax%3D1.96+%2Cy%3D2.56%E6%B1%82x-2%E2%88%9Axy%2By%2F%E2%88%9Ax-%E2%88%9Ay+%EF%BC%88me%E6%9C%89%E4%B8%AA%E7%96%91%E9%97%AE%E8%AF%B7%E5%BE%80%E4%B8%8B%E7%9C%8B%EF%BC%89%E7%AD%94%E6%A1%88%EF%BC%9Ax%3D1.96+%2Cy%3D2.56%E5%88%99%E2%88%9Ax%3D1.4%2C%E2%88%9Ay%3D1.6x-2%E2%88%9Axy%2By%2F%E2%88%9Ax-%E2%88%9Ay%3D%28%E2%88%9Ax-%E2%88%9Ay%29%26%23178%3B%2F%28%E2%88%9Ax-%E2%88%9Ay%29%3D%E2%88%9Ax-%E2%88%9Ay%3D1.4-1.6%3D-0.2%E4%B8%BA%E4%BB%80%E4%B9%882%E2%88%9Axy%E5%9C%A8%E4%B8%8B%E4%B8%80%E6%AD%A5%E5%B0%B1%E6%B2%A1%E4%BA%86%E5%91%A2)
题:x=1.96 ,y=2.56求x-2√xy+y/√x-√y (me有个疑问请往下看)答案:x=1.96 ,y=2.56则√x=1.4,√y=1.6x-2√xy+y/√x-√y=(√x-√y)²/(√x-√y)=√x-√y=1.4-1.6=-0.2为什么2√xy在下一步就没了呢
题:x=1.96 ,y=2.56求x-2√xy+y/√x-√y (me有个疑问请往下看)
答案:x=1.96 ,y=2.56
则√x=1.4,√y=1.6
x-2√xy+y/√x-√y
=(√x-√y)²/(√x-√y)
=√x-√y
=1.4-1.6
=-0.2
为什么2√xy在下一步就没了呢
题:x=1.96 ,y=2.56求x-2√xy+y/√x-√y (me有个疑问请往下看)答案:x=1.96 ,y=2.56则√x=1.4,√y=1.6x-2√xy+y/√x-√y=(√x-√y)²/(√x-√y)=√x-√y=1.4-1.6=-0.2为什么2√xy在下一步就没了呢
答:
(x-2√xy+y)/(√x-√y)
=[(√x)²-2√x*√y+(√y)²]/(√x-√y) 这一步缺少了?
=(√x-√y)²/(√x-√y)
=√x-√y
=1.4-1.6
=-0.2
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