(x+y)×(x-y)+(x-y)的平方-(x平方-3xy)等于多少,大哥大姐帮帮忙啊
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![(x+y)×(x-y)+(x-y)的平方-(x平方-3xy)等于多少,大哥大姐帮帮忙啊](/uploads/image/z/1014231-39-1.jpg?t=%EF%BC%88x%2By%29%C3%97%28x-y%29%2B%28x-y%29%E7%9A%84%E5%B9%B3%E6%96%B9-%EF%BC%88x%E5%B9%B3%E6%96%B9-3xy%29%E7%AD%89%E4%BA%8E%E5%A4%9A%E5%B0%91%2C%E5%A4%A7%E5%93%A5%E5%A4%A7%E5%A7%90%E5%B8%AE%E5%B8%AE%E5%BF%99%E5%95%8A)
(x+y)×(x-y)+(x-y)的平方-(x平方-3xy)等于多少,大哥大姐帮帮忙啊
(x+y)×(x-y)+(x-y)的平方-(x平方-3xy)等于多少,大哥大姐帮帮忙啊
(x+y)×(x-y)+(x-y)的平方-(x平方-3xy)等于多少,大哥大姐帮帮忙啊
(x+y)(x-y)+(x-y)²-(x²-3xy)
=(x-y)[(x+y)+(x-y)]-x(x-3y)
=2x(x-y)-x(x-3y)
=x[2(x-y)-(x-3y)]
=x(x+y)
x(x+y)
(x+y)(x-y)+(x-y)"-(x"-3xy)=(x-y)[(x+y)+(x-y)]-x(x-3y)=2x(x-y)-x(x-3y)=x"-xy("是平方)
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