已知x²-y²=﹣8,xy=﹣3,求5x²-3xy+4y²+11xy-7x²-2y²的值
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/07/29 05:37:29
已知x²-y²=﹣8,xy=﹣3,求5x²-3xy+4y²+11xy-7x²-2y²的值
求5x²-3xy+4y²+11xy-7x²-2y²的值
求5x²-3xy+4y²+11xy-7x²-2y²的值
解题思路: 合并同类项后,将x²-y²=﹣8,xy=﹣3代入求值
解题过程:
解:x²-y²=﹣8,xy=﹣3
5x²-3xy+4y²+11xy-7x²-2y²
=-2x²+2y²+8xy
=-2(x²-y²)+8xy
=-2×(-8)+8×(-3)
=16+(-24)
=-8
解题过程:
解:x²-y²=﹣8,xy=﹣3
5x²-3xy+4y²+11xy-7x²-2y²
=-2x²+2y²+8xy
=-2(x²-y²)+8xy
=-2×(-8)+8×(-3)
=16+(-24)
=-8
已知xy^2=-2,求-xy(x^2y^5-xy^3-y)的值.
已知xy/x+y=2,求代数式3x-5xy+3y/-x+2xy-y的值
已知x-y=2xy,求代数式3x-5xy-3y/x+xy-y的值
已知x-y=4xy,求x-2xy-y分之2x+3xy-2y的值!
已知xy=2(x+y),求(5x-xy+5y)/(3xy-x-y)的值
x+y=8,xy=-2,求(5xy+4x+7y)+(6x-3xy)-(4xy-3y)的值
已知:x-y=1,xy=-2.求:(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值
.已知:x-y=1,xy=-2.求:(-2xy+2 x+3y)-(3xy+2y-2x)-(x+4y+xy)的值
已知x+y=4,xy=2,求代数式2(3x+2xy)+(2xy+3x+2y)-(4xy-7y)的值
已知x+y=3,xy=1,求代数式5xy+4x+7y+6x-3xy-4xy+3y的值.
已知X+Y=6,xy=3求代数式(5XY+4X+7Y)+(6X-3XY)-(4XY-3Y)的值
已知x+y=5,xy=2,求5x+4y-3y-2y+xy的值