求完整步骤+得数,最好写纸上拍照,
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![求完整步骤+得数,最好写纸上拍照,](/uploads/image/z/6102332-44-2.jpg?t=%E6%B1%82%E5%AE%8C%E6%95%B4%E6%AD%A5%E9%AA%A4%2B%E5%BE%97%E6%95%B0%2C%E6%9C%80%E5%A5%BD%E5%86%99%E7%BA%B8%E4%B8%8A%E6%8B%8D%E7%85%A7%2C)
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求完整步骤+得数,最好写纸上拍照,
求完整步骤+得数,最好写纸上拍照,
求完整步骤+得数,最好写纸上拍照,
补充:(b+c)²=b²+c²+2bc=8+2×4=16
(b-c)²=b²+c²-2bc=8-2×4=0