3:4:5=4X:25-6X-4Y:5Y怎么算
2x-y=5 3x+4y=2怎么解
(3x-4y)(5x-4y)-(7x-8y)(6y-5x)
x^8-x^7y+x^6y^2-x^5y^3+x^4y^4-x^3y^5+x^2y^-xy^7+y^8
(y-x)(x-y)^3(y-x)^5怎么算
5x+4y=22 4x+y=3y+x 怎么解
5(x-y)^3*[-6/25(y-x)^3][-2/3(y-x^4]=
1) (2x+5y)(2x-5y)(-4x^2-25y^2) 2) [(x+y)(x-y)-(x-y)^2+2y(x-y
c语言中x=(x=++y,x+5,x/5) x=3 y=4怎么算
化简(x+y)-(2x+y/2)-(3x+y/6)-(4x+y/12)-(5x+y/20)-……-(10x+y/90)
6x-x=5x,4y-5y=-y怎么算的?是不是合并同类项?
(5x-3y)(3y+5x)-(4y-3x)(3x-4y)
(5x+3y)(3y-5x)-(4x-y)(4y+x)=