一种棱长20厘米的正方体礼物盒要用丝带捆扎好已知打蝴蝶结部分长30厘米捆扎两_百度知道
一种棱长20厘米的正方体礼物盒要用丝带捆扎好已知打蝴蝶结部分长30厘米捆扎两
怎么个 捆扎发
如果是十字捆扎法
那就是2X（4x20）+30=190厘米
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