先化简在求值:(2y+3x)(3x-2y)-(2y-3x)(2y+3x),其中x=-1,y=2
答案:6 悬赏:30 手机版
解决时间 2021-11-12 20:07
- 提问者网友:姑娘长的好罪过
- 2021-11-12 15:16
先化简在求值:(2y+3x)(3x-2y)-(2y-3x)(2y+3x),其中x=-1,y=2
最佳答案
- 五星知识达人网友:低血压的长颈鹿
- 2021-11-12 15:54
(2y+3x)(3x-2y)-(2y-3x)(2y+3x)
=(3x+2y)(3x-2y)+(3x+2y)(3x-2y)
=2(3x+2y)(3x-2y)
=2[(3x)²-(2y)²]
=2(9x²-4y²)
=18x²-8y²
=18×(-1)²-8×2²
=18-32
=-14
=(3x+2y)(3x-2y)+(3x+2y)(3x-2y)
=2(3x+2y)(3x-2y)
=2[(3x)²-(2y)²]
=2(9x²-4y²)
=18x²-8y²
=18×(-1)²-8×2²
=18-32
=-14
全部回答
- 1楼网友:毛毛
- 2021-11-12 20:01
(2y+3x)*(3x-2y-2y+3x)=(2y+3x)*(6x-4y)=2[(3x)^2-(2y)^2]=-14
- 2楼网友:零点过十分
- 2021-11-12 18:41
=((3x)^2-(2y)^2)-((2y)^2-(3x)^2)
=18x^2-8y^2
=-14
=18x^2-8y^2
=-14
- 3楼网友:佘樂
- 2021-11-12 17:20
(2y+3x)(3x-2y)-(2y-3x)(2y+3x)
=(2y+3x)(3x-2y)+(3x-2y)(2y+3x)
=2(2y+3x)(3x-2y)=2(4-3)(-3-4)
=-14
=(2y+3x)(3x-2y)+(3x-2y)(2y+3x)
=2(2y+3x)(3x-2y)=2(4-3)(-3-4)
=-14
- 4楼网友:污到你湿
- 2021-11-12 17:02
(2y+3x)(3x-2y)-(2y-3x)(2y+3x)
=(2y+3x)[(3x-2y)-(2y-3x)]
=(2y+3x)(3X-2Y-2Y+3X)
=(2y+3x)(6X-4Y)
=(4-3)(-6-8)
=14
=(2y+3x)[(3x-2y)-(2y-3x)]
=(2y+3x)(3X-2Y-2Y+3X)
=(2y+3x)(6X-4Y)
=(4-3)(-6-8)
=14
- 5楼网友:患得患失的劫
- 2021-11-12 16:55
:(2y+3x)(3x-2y)-(2y-3x)(2y+3x)
=(3x)²-(2y)²-(4y²-9x²)
=18x²-8y²
当x=-1,y=2时
原式=18-32
=-14
=(3x)²-(2y)²-(4y²-9x²)
=18x²-8y²
当x=-1,y=2时
原式=18-32
=-14
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