已知x-y=5,xy=3,则1/x-1/y=
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已知x-y=5,xy=3,则1/x-1/y=已知x-y=5,xy=3,则1/x-1/y=已知x-y=5,xy=3,则1/x-1/y=1/x-1/y通分=(y-x)/xy=-(x-y)/xy=-5/3-
已知x-y=5,xy=3,则1/x-1/y=
已知x-y=5,xy=3,则1/x-1/y=
已知x-y=5,xy=3,则1/x-1/y=
1/x-1/y通分
=(y-x)/xy
=-(x-y)/xy
=-5/3
-5/3!!!!!!!!!!!!!!!!!!!!!!!
先对1/x-1/y通分,结果是y/xy-x/xy=y-x/xy,把已知条件带入,x-y与y-x互为相反数,所以在y-x的整题前面加个负号就可以得到x-y,所以化解结果是-5/3
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