化简2x-(5x-3y)+(7x-y)
(2/3x-2/x+y(x+y/3x-x-y))÷x-y/x,其中5x+3y=0
x(x-y)-y(y-x)+(x-y)²因式分解
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
化简(2x+3y)(x-2y)-(2x+y)(2x-y)
(5x^3-7x^3y+3x^2y)+2x^3-(-7x^3y+3x^2y+7x^3)
因式分解x²(x-2y)+y²(2y-x)
y=5;x=14;y=((x=3*y,x+6),x-1); printf(''x=%d,y=%d'
先化简再求值:-3(2x-y)-{7-〔6x+2y-(10x-8y)〕+x-2(3x-4y)}已知x=-1/5,y=-5
计算:(1)2/(x+y)+4y/x²-y²(2)x²/x+y-x+y
7x+[-3x-3(x-2y)]-[5x-(2x-y)]
说明理由(5x³-7x³y+3x³y)+2x³-(-7x³y+3x&s
分解因式(x+y)3次方-y(x+y)平方+x平方(y+x)