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初中数学 已知m+n=8，mn=7，求m^2-n^2的值，学霸方法很简单
初中数学 已知m+n=8，mn=7，求m^2-n^2的值，学霸方法很简单
初中数学中考竞赛经典例题——代数部分237/465
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App02:27![初中数学 数学思维拓展 已知ab=1，求[1/(a+1)+1/(b+1)]^2019](http://p26-sign.bdxiguaimg.com/tos-cn-i-0000/ba89943a9c6f11e9ad647cd30a55d46c~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&biz_tag=list_custom%2Fnone&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=20250123164240CB4BE611C1568B8E0053&requestFrom=704&version_code=80402&x-expires=1769157760&x-signature=o%2FQFltpNG9MTH6kOg7Tjeic2n18%3D)
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