(X+Y)^2+2(X+1))+2y-1错了!2(X+1)+2Y-1中的-1呢?验算下给你看(x+y)*(x+y+2) =X^2+XY+2X+XY+Y^2+2Y-1到哪里去了?这步我算到过了。
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![(X+Y)^2+2(X+1))+2y-1错了!2(X+1)+2Y-1中的-1呢?验算下给你看(x+y)*(x+y+2) =X^2+XY+2X+XY+Y^2+2Y-1到哪里去了?这步我算到过了。](/uploads/image/z/12386387-11-7.jpg?t=%EF%BC%88X%2BY%29%5E2%2B2%28X%2B1%29%29%2B2y-1%E9%94%99%E4%BA%86%EF%BC%812%EF%BC%88X%2B1%EF%BC%89%2B2Y-1%E4%B8%AD%E7%9A%84-1%E5%91%A2%EF%BC%9F%E9%AA%8C%E7%AE%97%E4%B8%8B%E7%BB%99%E4%BD%A0%E7%9C%8B%28x%2By%29%2A%28x%2By%2B2%29+%3DX%5E2%2BXY%2B2X%2BXY%2BY%5E2%2B2Y-1%E5%88%B0%E5%93%AA%E9%87%8C%E5%8E%BB%E4%BA%86%EF%BC%9F%E8%BF%99%E6%AD%A5%E6%88%91%E7%AE%97%E5%88%B0%E8%BF%87%E4%BA%86%E3%80%82)
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(X+Y)^2+2(X+1))+2y-1错了!2(X+1)+2Y-1中的-1呢?验算下给你看(x+y)*(x+y+2) =X^2+XY+2X+XY+Y^2+2Y-1到哪里去了?这步我算到过了。
(X+Y)^2+2(X+1))+2y-1
错了!
2(X+1)+2Y-1
中的-1呢?
验算下给你看
(x+y)*(x+y+2) =X^2+XY+2X+XY+Y^2+2Y
-1到哪里去了?
这步我算到过了。
(X+Y)^2+2(X+1))+2y-1错了!2(X+1)+2Y-1中的-1呢?验算下给你看(x+y)*(x+y+2) =X^2+XY+2X+XY+Y^2+2Y-1到哪里去了?这步我算到过了。
=(X+Y)^2+2(X+Y)+1
=(X+Y+1)^2
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