=[5(x+y)]²-[4(x-y)]²
=(5x+5y+4x-4y)(5x+5y-4x+4y)
=(9x+y)(x+9y)
猜你喜欢
- 1英语翻译
- 2例句:Parents should tell their children to be careful when they are swimming in the river,仿照造
- 3请翻译Doctors see people all the time for this very problem.
- 4英语翻译
- 5长6米,宽4米的长方形花坛在比例尺是1:200的图纸上长是().宽是().图上面积是().
- 6We will hold a meet tomorrow.的被动语态.怎么变?
- 7学校舞蹈队有25人,合唱队的人数比舞蹈队的3倍多15人.合唱队有几人?
- 8一杯纯牛奶,喝去30%后,加满水,搅匀后再喝去50%,这时杯中的纯牛奶占杯子容量的_%.
- 9向量a(3 ,4),向量b(6,8)分别与向量c(2,k)的夹角相等,求K的值
- 10专心致志一词比喻什么