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数学
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(x+y)^2+3(x^2-y^2)+2(x+y)
x加y的平方,加上x的平方减y的平方乘3,加上x+y乘2,因式分解,好的,
人气:307 ℃ 时间:2020-06-05 05:03:10
解答
(x+y)²+3(x²-y²)+2(x+y)
=(x+y)²+3(x+y)(x-y)+2(x+y)
=(x+y)[x+y+3(x-y)+2]
=(x+y)(4x-2y+2)
=2(x+y)(2x-y+1)
点拨:x²-y² 应用平方差公式,化为(x+y)(x-y)
再提取每一项公有的(x+y),运用乘法分配律
最后提取(4x-2y+2)中的2,得2(2x-y+1)
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