(x-3y)(x+3y)-(x-3y)^2
答案:6 悬赏:20 手机版
解决时间 2021-11-16 15:23
- 提问者网友:欲望失宠
- 2021-11-15 16:45
(x-3y)(x+3y)-(x-3y)^2
最佳答案
- 五星知识达人网友:旧脸谱
- 2021-11-15 18:25
(x-3y)(x+3y)-(x-3y)^2
=x²-9y²-(x²-6xy+9y²)
=6xy-18y²
=x²-9y²-(x²-6xy+9y²)
=6xy-18y²
全部回答
- 1楼网友:独行浪子会拥风
- 2021-11-15 23:19
法一:(x-3y)(x+3y)-(x-3y)^2=((x-3y)【(x+3y)-(x-3y)】=6xy-18y²
法二:(x-3y)(x+3y)-(x-3y)^2 =x²-9y²-(x²-6xy+9y²) =6xy-18y²
【【不清楚,再问;满意, 请采纳!祝你好运开☆!!】】
法二:(x-3y)(x+3y)-(x-3y)^2 =x²-9y²-(x²-6xy+9y²) =6xy-18y²
【【不清楚,再问;满意, 请采纳!祝你好运开☆!!】】
- 2楼网友:蕴藏春秋
- 2021-11-15 22:02
(x-3y)(x+3y)-(x-3y)^2
=(x-3y)[(x+3y)-(x-3y)]
=6y(x-3y)
=(x-3y)[(x+3y)-(x-3y)]
=6y(x-3y)
- 3楼网友:独行浪子会拥风
- 2021-11-15 21:23
(x-3y)(x+3y)-(x-3y)^2
=x^2-9y^2-x^2+6xy-9y^2
=6xy-18y^2
=6y(x-3y)
=x^2-9y^2-x^2+6xy-9y^2
=6xy-18y^2
=6y(x-3y)
- 4楼网友:第幾種人
- 2021-11-15 21:00
原式=X^2-9Y^2-(X^2-6XY+9Y^2)=6XY
- 5楼网友:人類模型
- 2021-11-15 19:35
6xy-18y²
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