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六上数学：把8:12的前项加4，要使比值不变，后项怎么样变化？
六上数学+奥数34/95
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App05:23![六年级奥数：讲透裂和计算中的数学知识[乘1/N]](http://p3-sign.bdxiguaimg.com/tos-cn-i-0026/26c9ead8f4554f76a470a62d9e069dca~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=2024111807573401274B1C9B955277AFCE&requestFrom=704&version_code=80402&x-expires=1763423854&x-signature=PkoJmMwQrKdDOQIwLXyNVHejKjY%3D)
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