先化简再求值[﹙y-3x﹚﹙-3x-y﹚-9﹙x-2y﹚²]÷3y,其中x=-2,y=3
人气:483 ℃ 时间:2019-10-17 03:25:44
解答
[﹙y-3x﹚﹙-3x-y﹚-9﹙x-2y﹚²]÷3y
=[9x²-y²-9﹙x²-4xy+4y²)]÷3y
=(9x²-y²-9x²+36xy-36y²)÷3y
=(36xy-37y²)÷3y
=(36x-37y)÷3
=12x-37y/3
=12*(-2)-37*3/3
=-24-37
=-61
推荐
- 化简并求值:(3x+2y)(3x-2y)-(3x+2y)²+(3x-2y)²,其中x=-1/3,y =1/2
- 先化简 再求值;(4x-3y)²-(3x-2y)(3x+2y)其中x=2,y=1
- 先化简,再求值:(x+y)2-3x(x+3y)+2(x+2y)(x-2y),其中x=-1/3,y=1/3.
- 已知:4x-y=0,化简分式x²+3y/2y-3x.
- (x-y)(x-2y)-(3x-2y)(x-3y),其中X=4,Y= -1,先化简,再求值
- I’d like(非缩略形式)
- financial crisis in western countries reason how to solve it
- 有关原核生物DNA复制过程中,RNA引物的叙述,哪项是正确的?
猜你喜欢