10x+2y=170;4x+10y=160 怎么算
已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai
当x=2000,y=-10时计算x^2-2xy+y^2分之x^4-Y^4乘x^2+y^2分之y-x
由题意:(10Y+X)-(10X+Y)=(100X+Y)-(10Y+X) Y=6X 怎么算的啊 发一些详细的
已知2x-y=10,求式子[(x^2+y^2)-(x-y)^2+2y(x-y)]/4y (4xy-2y²)/4
x y xy=10怎么算
2x-y=-3(1) 3x+4y=10(2)怎么解
2x-y=3(1) 3x+4y=10(2)怎么解
已知:4x^2+y^2-4x-6y+10=0,求y/x-x/y的值
解方程组 10(x-y)=3(x+y)+15 6(x+y)=4(2x-y)+16
2x+y=4x-y-1/2=10+6x+2y/4
已知x+y=4,x^2+y^2=10,求(x-y)^2