Mathematics
Junior High
この問題はどのように解けばよいのでしょうか？
わかる方教えてくれると嬉しいです！
13x, y(x+y+2)(x-y-2)-(x-y+ 2)²= ax2 + bxy+cy²+dx+ey+ƒ³)
つときの, a+b+c+d + e + f の値を求めよ。
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