4x^2-8x-12y-9y^2答案

(2x-y)^2-4(x-y)(x+2y)答案是9y^2-8xy``` (-4+3y)(-3y-4x)-(2x+3y)(8x-9y) 求答案 4x^2-8x-12y-9y^2答案 81/8*(-x-y)^6*(x-y)^3*4/9(x+y)^4*(y-x)^2 4x^4y^2-5x^2y^2-9y^2 答案 求x ,y 9x^2+4y^2-12x-8y+8=0 已知M={y|y=x²-4x+3,x∈R},N={y|y=-x²+2x+8,x∈R},求M∩N 答案是{y|-1≤y≤9} 4(x+y)^2-12(x+y)(x-y)+9(+y)^2因式分解, 【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y) 9(x-y)-12(y-x)^2 因式分解4x^2-8x-12y-9y^2过程和答案哦急在线等哦 25（x-2y)平方-4(y-2x)平方答案是3(3x-4y)(x-8y)还是21(x-2y)2还是（7x-6y）有（3x-14y) C语言 答案为什么是8 4 #includevoid f(int y,int *x){y=y+*x;*x=*x+y;}main(){int x=2,y=4;f(y,&x);printf(%d %d ,x,y);} 9y=3x-(x-1),4(x+y)-(2x+4)=8y 已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值 (16x^4+y^4)(4x^2+2y^2)(2x-y)(2x+y)的答案是什么? 12x^2+xy-6y^2答案是（3x+3y）（4x-2y）吗? x>0y>0x+y=1,x^2+y^2+根号xy的最大值答案是9/8