(3x-y)²+6xy等于多少?还有两道类似的题:(1)(x-1)²×(x+1)² (2)(2x-5)²-(x+7)²这几道题都是有关于完全平方公式来解答的,
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![(3x-y)²+6xy等于多少?还有两道类似的题:(1)(x-1)²×(x+1)² (2)(2x-5)²-(x+7)²这几道题都是有关于完全平方公式来解答的,](/uploads/image/z/1119837-21-7.jpg?t=%EF%BC%883x-y%EF%BC%89%26%23178%3B%2B6xy%E7%AD%89%E4%BA%8E%E5%A4%9A%E5%B0%91%3F%E8%BF%98%E6%9C%89%E4%B8%A4%E9%81%93%E7%B1%BB%E4%BC%BC%E7%9A%84%E9%A2%98%EF%BC%9A%EF%BC%881%EF%BC%89%EF%BC%88x-1%EF%BC%89%26%23178%3B%C3%97%EF%BC%88x%2B1%EF%BC%89%26%23178%3B+%EF%BC%882%EF%BC%89%EF%BC%882x-5%EF%BC%89%26%23178%3B-%EF%BC%88x%2B7%EF%BC%89%26%23178%3B%E8%BF%99%E5%87%A0%E9%81%93%E9%A2%98%E9%83%BD%E6%98%AF%E6%9C%89%E5%85%B3%E4%BA%8E%E5%AE%8C%E5%85%A8%E5%B9%B3%E6%96%B9%E5%85%AC%E5%BC%8F%E6%9D%A5%E8%A7%A3%E7%AD%94%E7%9A%84%2C)
(3x-y)²+6xy等于多少?还有两道类似的题:(1)(x-1)²×(x+1)² (2)(2x-5)²-(x+7)²这几道题都是有关于完全平方公式来解答的,
(3x-y)²+6xy等于多少?
还有两道类似的题:(1)(x-1)²×(x+1)² (2)(2x-5)²-(x+7)²
这几道题都是有关于完全平方公式来解答的,
(3x-y)²+6xy等于多少?还有两道类似的题:(1)(x-1)²×(x+1)² (2)(2x-5)²-(x+7)²这几道题都是有关于完全平方公式来解答的,
(3x-y)²+6xy 完全平方化出来
=9x²-6xy+y²+6xy
=9x²+y²
(1)
(x-1)²×(x+1)²
=[(x-1)(x+1)]² 里面平方差
=(x²-1)² 完全平方
=(x²)²-2x²+1
=x^4-2x²+1
(2)
(2x-5)²-(x+7)² 平方差
=[(2x-5)-(x+7)][(2x-5)+(x+7)]
=(2x-5-x-7)(2x-5+x+7)
=(x-12)(3x+2)