121（x-y)＾2－169(x+y)＾2分解因式

121（x-y)＾2－169(x+y)＾2分解因式 因式分解4（x－y）＾2－12（y－x）＋y 求方程y”－2y'+y=1+(x+2)e＾x的通解. x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 因式分解 X＾4（X－y）－y＾4（X－y） 化简y(x+y)+(x+y)(x-y)-x^2 【就一部不懂】如果x、y∈R,且x≠y,比较(x2+y2)2与xy(x+y)2大小作差法 (x2+y2)2-xy(x+y)2 =x＾4+y＾4+2x＾2y＾2-x＾3y-2x＾2y＾2－xy＾3 =(x-y)(x＾3-y＾3) =(x-y)＾2[(x+y/2)＾2+3y＾2/4] ∵x≠y (x-y)＾2＞0,(x+y/2)＾2+3y (x-3y)(-3y-x)-2(x-3y)＾2要过程 (x+y)(x-y)-(x-y)^2如题 (x+y)(x-y)-(x-y)^2 【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y) 因式分解x(x+y)(x-y)-x(x+y)^2 （-x/x-y）＾2乘x＾2-y＾2/x 先化简再求植:0.5(x+y+2)＾+0.5(x-y-2)(x-y+2)-2(x+y)其中x-y=6,xy=21 把(x+y),(x-y)个作为一个整体合并同类项1,7(x+y)-2(x+y)-4(x+y)+2(x+y)2,(x-y)²＋2(x-y)－(x-y)－2(x-y)² [(x-y)^2-(x+2y)(x-2y)]/y 计算:y-x分之x+y+x-y分之y-y-x分之2x-y 把多项式X＾2-Y＾2-2X－4Y-3因式分解急! 1／2x－（x+y／2x -x-y）÷（x+y)