Question

3x²-6xy+3y²-5x+5y a²-b²-x²+y²-2ay+2bx 谢谢咯

Answer 1

3x²-6xy+3y²-5x+5y
=3(x-y)²-5(x-y)
=(x-y)(3x-3y-5)

a²-b²-x²+y²-2ay+2bx
=(a²-2ay+y²)-(b²-2bx+x²)
=(a-y)²-(b-x)²
=(a+b-x-y)(a-b+x-y)

Answer 2

(3x-5)/(x²+2x-3)-2≤0
(3x-5-2x²-4x+6)/(x²+2x-3)≤0
(-2x²-x+1)/(x²+2x-3)≤0
相除小于等于0则相乘小于等于0
(-2x²-x+1)(x²+2x-3)≤0
两边乘-1
(2x²+x-1)(x²+2x-3)≥0
(x+1)(2x-1)(x+3)(x-1)≥0
零点是-3,-1,1/2,1
所以x≤-3，-1≤x≤1/2，x≥1
分母x²+2x-3≠0
(x+3)(x-1)≠0
x≠-3,x≠1

所以x<-3，-1≤x≤1/2，x>1

Answer 3

ni da gong shi,bu yao dong,
jiu zhan zai na!
qian wan bu yao shuo hua a!
ni zhi neng reng xue qiu zhi lei.
bian ren de ni shi yi xia ba!
hao you dou ke yi dong,bai bao xiang jiu shi peng peng yun qi lo!
huo zhe quan bu xing jiu cong shang.