3x+x²-y²-3y
=(x²-y²)+(3x-3y)
=(x+y)(x-y)+3(x-y)
=(x-y)(x+y+3)
猜你喜欢
- 1小华从A点出发向前直走50米,向左转18',继续向前走50米,再左转18',他一同样走法回到A点时,共走?米
- 2He often helps his mother ____ housework over the weekend.
- 3描写夏天景色的四字词语,要50个,
- 4某天体半径为R,密度为P,则在其表面的重力加速度g等于多少米每平方秒?
- 5某修路队修一段公路,第一天修这段公路的五分之二,第二天修了70米,这时已修的长度与未修的比是3:1.
- 6社戏中21到40段的景物描写有哪些作用
- 7Hip-hop dancing is popular with many young people today.They like it because
- 8找词语中结构相同的一组
- 9If you can answer this question c______,you will get a nice present.
- 10设函数f(x)=x^4+ax^3+2x^2+b(x∈R),a,b∈R.(1)若对任意的a∈[-2,2]不等式f(x)≤1在[-1,0]上恒成立,