4x+5y=9 2x-3y=-5 怎么算?
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
(y-x)(x-y)^3(y-x)^5怎么算
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
2x-y=8 3x+2y=5与3x+2y=1 3x-4y=-11用加减法怎么算?
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
5x+4y=22 4x+y=3y+x 怎么解
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(
数学题……555{(3x+y)(3x-y)-(x-5y)(5x-y)-(x-2y)²÷(-4x),x=-2.y
4x平方-9y平方=15 2x-3y=5 怎么解
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai
c语言中x=(x=++y,x+5,x/5) x=3 y=4怎么算
5x=3y,(2x+y)的平方=5x(x+y)+9