x-2y/x+y 减 x-y/x+y 加 -x-4y/x+4y初二上学期分式的加减.

化简 (x减y)(x加y)加(x减y)加(x加y)等于 x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 x减y分之x加y乘以x加y分之x减y {(x,y) |x|+|y| x>y?x:y 化简y(x+y)+(x+y)(x-y)-x^2 (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) x-2y/x+y 减 x-y/x+y 加 -x-4y/x+4y初二上学期分式的加减. 因式分解x(x+y)(x-y)-x(x+y)^2 X加Y (3x加y)(3x减y)加(x减y)(x加y),其中x等于2,y等于负3 (平方差公式) (2x减y)的平方减4(x减y)(x加2y) x减2y等于1x加2y等于3.x.y是多少 (x减y) (x平方加xy加y平方) X平方减y平方加x加y [(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