x-y的差的平方等于多少？ x减y的平方的差是多少
x\u4e0ey\u7684\u5dee\u6216\u548c\u7684\u5e73\u65b9\u600e\u4e48\u7b97\uff08x-y\uff09²=x²-2xy+y²\uff0c\uff08x+y\uff09²=x²+2xy+y²\u3002
\uff08x-y\uff09²
=\uff08x-y\uff09\uff08x-y\uff09
=x²-2xy+y²
\uff08x+y\uff09²
=\uff08x+y\uff09\uff08x+y\uff09
=x²+2xy+y²
\u6269\u5c55\u8d44\u6599\uff1a
\u5176\u4ed6\u516c\u5f0f\uff1a
1\u3001\u5e73\u65b9\u5dee\u516c\u5f0f\uff1aa²-b²=(a+b)(a-b)\u3002
2\u3001\uff08a+b\uff09³\uff1da³\uff0b3a²b\uff0b3ab²\uff0bb³
3\u3001a³+b³=a³+a²b-a²b+b³
=a²\uff08a+b\uff09-b\uff08a²-b²\uff09
=a²\uff08a+b\uff09-b\uff08a+b\uff09\uff08a-b\uff09
=\uff08a+b\uff09[a²-b\uff08a-b\uff09]
=\uff08a+b\uff09\uff08a²-ab+b²\uff09
4\u3001a³-b³=a³-a²b+a²b-b³
=a²\uff08a-b\uff09+b\uff08a²-b²\uff09
=a²\uff08a-b\uff09+b\uff08a+b\uff09\uff08a-b\uff09
=\uff08a-b\uff09[a²+b\uff08a+b\uff09]
=\uff08a-b\uff09\uff08a²+ab+b²\uff09
x-y*y
（x - y）²=x² - 2xy + y²
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绛旓細锛(x-y)(x+y)锛塣2=(x^2-y^2)^2=16,骞虫柟宸鍏紡
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绛旓細x²-y²=(x-y)(x+y) 骞虫柟宸鍏紡
