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数学
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x2+y2+z2+2xy+2yz+2zx 将这个式子因式分解 顺便说几个类似的式子.
人气:392 ℃ 时间:2020-05-21 03:47:13
解答
x2+y2+z2+2xy+2yz+2zx
=x²+2xy+y²+2xz+2yz+z²
=(x+y)²+2z(x+y)+z²
=(x+y+z)²
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