(10x+y)-(10y+x)化简
因式分解:25(x-y)²+10(y-x)+1
(x+y)(x+y+10)+25=0 x-y=3.求x,y的值
10/x+y+3/x-y=-5 15/x+y-2/x-y=-1(用换元法解此方程组)
解方程组x+y=15 (x+15%x+y+10%y)=17
化简 2x-[3y-5x-(-2x-7y)]等于 ( ) A:-7x+10y B:5x+4y C:-x-4y D:9x-
已知2x-y=10,求((x+y)-(x-y)+2y(x-y))÷4y的值
已知y-2x=10,求[2y(x-y)-(x-y)2+(x+y)2-2xy]÷4y的值.
已知2x-y=10,求代数式[(x²+y²)-(x-y)²+2y(x-y)]÷4y的值?
已知2x-y=10 【(x²+y²)-(x-y)²+2y(x-y)】÷4y 过程
2x-y=10 【(x²+y²)-(x-y)²+2y(x-y)】÷4y
解方程组:(0.2x+0.1y)/2- (4x-y)/10=(x-y)/5+ (3x+0.5y)/30 (3x+2y-1
1.x(x-y)+y(y-x)2.9(a-b)^2-16(a+b)^2 3.25(x-y)^2+10(y-x)+1