5X=2,5Y=3,5X+Y
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3x(2x+y)-2x(x-y),其中x=1,y=1/5
化简:5(x-y)+2(x+y)-3(x-y)
若(X×X+Y×Y)(X×X+Y×Y-5)=36,则X×X+Y×Y=
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
若|x-y-5|与|2x+3y-15|互为相反数,则x+y=?
(2x-3y)-(5x-y)
(2X-3y)-(5x-y)
(2x-5y)(3x+y)
因式分解(x-2y)(x-3y)+(x-4y)(x-5y)+(x-3y)(x-5y)+(x-2y)(x-4y)
(2x+y)²+(x+3y)(x-3y)-x(5x+8y)因式分解
(2/3x-2/x+y(x+y/3x-x-y))÷x-y/x,其中5x+3y=0
[2(x-y)^5-8(x-y)^2(x+y)+6y(x-y)^2]÷2(x-y)^2[2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2]÷2(x-y)^2
(3x+2y)(4x-5y)-11(x+y)(x-y)+5xy,其中x=三分之一,y=-二分之一.先化简再求值.
[(x+2y)的平方-(x+y)(3x-y)-5y的平方]÷(2x),其中x=-1,y=-2.
已知-x+2y=5则5(x-2y)-3(x-2y)-60
X,Y的值是X+3Y=5,X≡2,Y等于多少?
2x+5y=4.4y-3x=8解方程组 2x+5y=232y-3x=10
[(x+2y)(x-2y)-(2x-y)^2+(3x-y))2x-5y)]/(-x)我急用