把下列多项式因式分解:
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/06/23 01:55:37
把下列多项式因式分解:
(1)4x²-20xy+25y²
(2)9-12(x-y)+4(x-y)²
(1)4x²-20xy+25y²
(2)9-12(x-y)+4(x-y)²
![把下列多项式因式分解:](/uploads/image/z/7233706-10-6.jpg?t=%E6%8A%8A%E4%B8%8B%E5%88%97%E5%A4%9A%E9%A1%B9%E5%BC%8F%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%EF%BC%9A)
(1)
4x²-20xy+25y²
=(2x)²-2*2x*5y+(5y)²
=(2x-5y)²
(2)
9-12(x-y)+4(x-y)²
=3²-2*3*2(x-y)+[2(x-y)]²
=(3-2x-2y)²
=(2x+2y-3)²
再问: 计算题:-√6*√42*(-3√7)
再答: -√6*√42*(-3√7)
=3√6*√7*√¥2
=3√42*√42
=3*42
=126
4x²-20xy+25y²
=(2x)²-2*2x*5y+(5y)²
=(2x-5y)²
(2)
9-12(x-y)+4(x-y)²
=3²-2*3*2(x-y)+[2(x-y)]²
=(3-2x-2y)²
=(2x+2y-3)²
再问: 计算题:-√6*√42*(-3√7)
再答: -√6*√42*(-3√7)
=3√6*√7*√¥2
=3√42*√42
=3*42
=126