(a+b+c)^2=?注:(a+b+c)^2意为a+b+c括号的平方.
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![(a+b+c)^2=?注:(a+b+c)^2意为a+b+c括号的平方.](/uploads/image/z/1989482-50-2.jpg?t=%28a%2Bb%2Bc%29%5E2%3D%3F%E6%B3%A8%3A%28a%2Bb%2Bc%29%5E2%E6%84%8F%E4%B8%BAa%2Bb%2Bc%E6%8B%AC%E5%8F%B7%E7%9A%84%E5%B9%B3%E6%96%B9.)
(a+b+c)^2=?注:(a+b+c)^2意为a+b+c括号的平方.
(a+b+c)^2=?
注:(a+b+c)^2意为a+b+c括号的平方.
(a+b+c)^2=?注:(a+b+c)^2意为a+b+c括号的平方.
(a+b+c)^2=a^2+2a(b+c)+(b+c)^2
=a^2+2ab+2ac+b^2+2bc+c^2
=a^2+b^2+c^2+2ab+2ac+2bc
(a+b+c)平方=a平方+ab+ac+b平方+ab+bc+c平方+ac+bc=a平方+b平方+c平方+2ab+2bc+2ac