初二数学计算题 已知2x-y=10,求((x^2+y^2)-(x-y)^2+2y(x-y))/4y
已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y
初二整式计算题已知4x²+4x+y²-2y+2=0,求x+y的值
计算题(2x+y)(x+2y)-(2x+3y)(3x-2y)
初二数学已知(x-y):y=2:3,求(2x+5y):(3x-y)的值
已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
已知4x=9y求(1)x+y/y (2)y-x/2x
计算题:(9x-4y)(-3x+2y)(-2y-3x)
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
数学.计算题. (1)、二元一次方程组. {x-y=3 2y+4(x-y)=14
计算题:(2x+3y)^2-(4x-9y)(4x+9y)+(2x-3y)^2