3(x-y)²-18(x-1)+27
问题描述:
3(x-y)²-18(x-1)+27
还有一个
3(x-1)²-18(x-1)+27
答
您好: 3(x-y)²-18(x-y)+27=3【(x-y)²-6(x-y)+9】=3(x-y-3)² 3(x-1)²-18(x-1)+27=3【(x-1)²-6(x-1)+9】=3(x-1-3)²=3(x-4)² 如果本题有什么不明白可以追问...3(x-1-3)²可以化为3(x-4)²吗??就这个我想了好久可以呀,怎么不行