(x+y)/25+(a-b)/5-(1/5)[a-b-(24/5)(x+y)]
(5)a(x+y)-b(x+y)-x-y
分解公因式p(x-y)-q(y-x)(a+b)(a-b)-(b+a)10a(x-y)^2-5b(y-x)3p(m-2n)
已知a^x-y*a^2y+1=a^11,且b^x-1*b^4-y=b^5,求(x^2)*y的值
define A(x,y) x*y-x/y main(){int a=5,b=2,y;y=A(a+b,a-b);prin
1、A={(x,y)|y=x平方-4x=5},B={(x,y)|y=2x平方-7},求A交B
1、(a-b)(x-y)-(b-a)(x+y)
A={y|y=-4x+6},B={x|y=5x-3},求A∩B.
(1)(3a-3b)+6(b-a) (2)5x(x-3y)^2-(3x+2y)(3y-x)^2
已知(a^2b)^x·(a^x-1·b^2-y)^5=x^9·y^7,求x、y的值
1)已知4X=5y,求(X+y):y 2)已知(a-b):(a+b)=3:7,求a:b
计算:(1) (2x-3y)+(5x+4y) (2) (8a-7b)-(4a-5b)
已知集合A={Y/Y=X方-4X+5},B={X/Y=根号5-X} 求A交B A并B