求方程组 (x+5)×(y-5)=xy (x+10)×(y-9)=xy
已知x、y的方程组3(x²+y²)-5xy=6,2(x²+y²)+xy=17,求
x-y=3,xy=5,求代数式(7xy+4x-7y)+(6x-3xy)-(3y+4xy)的值
若(3xy+2)+|7-x-y|=0,求代数式(5xy+10y)-[-5x-(4xy-2y+3x)]的值.
已知xy=2,x+y=3,求(3xy+10y)+[5x-(2xy+2y-3x)]的值.
亲们~已知xy=-2,x+y=3,求(3xy+10y)+[5x-(2xy+2y-3x)] 的值
1/x-1/y=5求(-x+xy+y)/(2x+7xy-2y)
已知关于x、y的方程组3(x²+y²)-5xy=6;2(x²+y²)+xy=17
解方程组(要过程)x^2+y^2=10 x+xy+y=7
已知x-y=6,xy=-2,求3(xy+x-2y)-5(y-2x)+2(xy-x)的值.
已知(x+3)+丨X-y+10丨=0 ,求5x²y-[2x²y-(3xy-xy²)-3x&
已知(x+2)^2+|x+y+5|=0,求3x^2y-[2x^2y-(2xy-x^2y)-4x^2]-xy
已知xy^2=-6,求-xy(x^3y^7-3x^2y^5-y)的值