207x^3y^3 -12x^5 -27xy ^4

3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27 （x+y-5)*（x+y-5)+（x-y+3)=0 x*x-y*y 已知:3x-5y=0,求x/y,x-y/y,x-y/x 1.) 5/x-x+12-2x/2x-2x 2)y/2x-2y/3x 化简:5(x-y)+2(x+y)-3(x-y) (y-x)(x-y)^3(y-x)^5怎么算 化简(x+y)-(2x+y/2)-(3x+y/6)-(4x+y/12)-(5x+y/20)-……-(10x+y/90) 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) (2x+y)²+(x+3y)(x-3y)-x(5x+8y)因式分解 (2x-3y)-(5x-y) (2X-3y)-(5x-y) (2x-5y)(3x+y) 计算(x+y)(x-y)(x+y)3次方(x-y)5次方计算(x+y)×(x-y)×(x+y)3次方×(x-y)5次方 因式分解(x-2y)(x-3y)+(x-4y)(x-5y)+（x-3y)(x-5y)+(x-2y)(x-4y) (1)x^2*x^8+x^13/x^3 (2)a^19/a^12/a^3 (3) (x-2y)^5/(2y-x)^3 (4)(x-y)^5/(x-y) (5)(x-y)^6/(y-x)^4 (3x-y)(3y+x)-(x-y)(x+y) 本人初学者 下面程序的运行结果是(　　)main(){int y＝5,x＝14； y＝((x＝3*y,x+6),x-1);printf(x=%d,y=%d,x,y);}A) x＝27,y＝27B) x＝12,y＝13C) x＝15,y＝14D) x＝y＝27 1.5（x+y）+3（x-y）=27（x+y）-3（x-y）=-62.x-y/7 - x+y/10 =1/22(x-y)-5(x+y)=3所谓细节决定成败,