Question

(x-y)的4次方/(y-x)的3次方+(x-y)0的次方*(y-x)+(-x-y)7次方/(x+y)6次方=

Answer 1

解(x-y)的4次方/(y-x)的3次方+(x-y)0的次方*(y-x)+(-x-y)7次方告握正/(x+y)6次方袜悔
=-(x-y)的4次皮厅方/(x-y)的3次方+1*(y-x)-(x+y)7次方/(x+y)6次方
=-(x-y)+（y-x）-（x+y）
=-x+y+y-x-x-y
=-3x+y

Answer 2

(x-y)^4/(y-x)^3+(x-y)^0*(y-x)+(-x-y)^7/穗粗衡猜做凳嫌(x+y)^6
=y-x+y-x-(x+y)=y-x+y-x-x-y
=y-3x