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六年级奥数：甲乙比7:5，甲校给乙校650本，现在比是3:4，求甲书
六上数学+奥数86/95
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App03:05![六年级奥数：详细讲解分母是三个自然数相乘的裂项计算[乘1N]](http://p3-sign.bdxiguaimg.com/tos-cn-i-0026/osgftABaEt0BC7AlWtGuSIQbycAHtztQSAhQAA~tplv-pk90l89vgd-crop-center:576:324.jpeg?appId=3586&channelId=0&customType=custom%2Fnone&from=704_middle_image&imageType=list&isImmersiveScene=0&is_ios=1&is_stream=0&lk3s=9d3f5bff&logId=20241118132941EE8099354CFE66A7CFE1&requestFrom=704&version_code=80402&x-expires=1763443782&x-signature=xRQxOMnS3ML7ysD5%2B%2FA7oaibffM%3D)
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