@洒龙煜
题目
@洒龙煜
(2x+y-3)²
(2x+y-3)(2x+y+3)
[(x+y)²-(2xy)²]÷(-2xy)
(2x-3y)²-(3x-2y)(x+y)
答案
4x²+y²+4xy-12x-6y+9
4x²+y²+4xy-9
2xy-x/2y-y/2x-1
x²+11y²-13xy
举一反三
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我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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