(x的二次方) - (2XY) 加上 (Y的二次方) = ( ) - 4
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/31 00:26:51
![(x的二次方) - (2XY) 加上 (Y的二次方) = ( ) - 4](/uploads/image/z/2831931-27-1.jpg?t=%28x%E7%9A%84%E4%BA%8C%E6%AC%A1%E6%96%B9%29%26%23160%3B+-%26%23160%3B%26%23160%3B+%282XY%29%26%23160%3B+%E5%8A%A0%E4%B8%8A%26%23160%3B%26%23160%3B%26%23160%3B+%28Y%E7%9A%84%E4%BA%8C%E6%AC%A1%E6%96%B9%29%26%23160%3B+%3D%26%23160%3B%26%23160%3B+%28%26%23160%3B%26%23160%3B%26%23160%3B%26%23160%3B%26%23160%3B%26%23160%3B%26%23160%3B%26%23160%3B%26%23160%3B%26%23160%3B%26%23160%3B%26%23160%3B%26%23160%3B%26%23160%3B%26%23160%3B%26%23160%3B%26%23160%3B+%29%26%23160%3B%26%23160%3B+-%26%23160%3B%26%23160%3B+4)
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(x的二次方) - (2XY) 加上 (Y的二次方) = ( ) - 4
(x的二次方) - (2XY) 加上 (Y的二次方) = ( ) - 4
(x的二次方) - (2XY) 加上 (Y的二次方) = ( ) - 4
x²-2xy+y²=(x²-2xy+y²+4)-4
即x²-2xy+y²=[(x-y)²+4]-4
4后面没什么吗?
(X+Y)的二次方=X的二次方+Y的二次方+2XY
所以这道题答案是(X+Y)的二次方—4XY
我只知道等于(x-y)的平方……
那括号里就是(x-y)的平方+4喽