作业帮如果(x+1)^2+/y+2/=0,求代数式5xy-2/3x^3y^2-4yx+1/2y^2x^3-1/2xy-3x^3y^2-y^2x^3的值5xy-3/2x^3y^2-4yx+1/2y^2x^3-1/2xy-3x^3y^2-y^2x^3
来源：学生作业帮助网 编辑：作业帮 时间：2024/12/01 15:01:50
xQJ@Y*0Ĩ|J@?@nfvQ*">n|"&-
Bpw=s (-[?uZ 8vĔ8wO*P Chb_r!t-MLu|aG$? H?_~4Qj6c
$}$b0|&p5 { TpCG'̐u-hB
۶֭uh:f#UT7ko暊A`c˫UL6N粇~_u|>
如果(x+1)^2+/y+2/=0,求代数式5xy-2/3x^3y^2-4yx+1/2y^2x^3-1/2xy-3x^3y^2-y^2x^3的值5xy-3/2x^3y^2-4yx+1/2y^2x^3-1/2xy-3x^3y^2-y^2x^3
如果(x+1)^2+/y+2/=0,求代数式5xy-2/3x^3y^2-4yx+1/2y^2x^3-1/2xy-3x^3y^2-y^2x^3的值
5xy-3/2x^3y^2-4yx+1/2y^2x^3-1/2xy-3x^3y^2-y^2x^3
如果(x+1)^2+/y+2/=0,求代数式5xy-2/3x^3y^2-4yx+1/2y^2x^3-1/2xy-3x^3y^2-y^2x^3的值5xy-3/2x^3y^2-4yx+1/2y^2x^3-1/2xy-3x^3y^2-y^2x^3
没有写错啊
(x+1)^2+/y+2/=0
平方和绝对值的值恒为非负值
只有两数都为0的时候,和才为0
所以x+1=0,y+2=0
x=-1,y=-2
xy=2
5xy-2/3x^3y^2-4yx+1/2y^2x^3-1/2xy-3x^3y^2-y^2x^3
=1/2 x y - 25/6 x^3 y^2
=15+8/3
=17又2/3
(x+1)^2+/y+2/=0
x=-1,y=-2
5xy-2/3x^3y^2-4yx+1/2y^2x^3-1/2x y-3x^3y^2-y^2x^3
=1/2 x y - 25/6 x^3 y^2
=53/3