先化简:(x-y分之x+y减x+y分之x-y)乘(x²分之1减y²分之1),当x=2+根号3,y=2-根号3时,的值为多少

问题描述:

先化简:(x-y分之x+y减x+y分之x-y)乘(x²分之1减y²分之1),当x=2+根号3,y=2-根号3时,的值为多少

x-y分之x+y减x+y分之x-y将其进行通分则得[(x+y)²-(x-y)²]/x²-y²=4xy/x²-y²x²分之1减y²分之1将其进行通分则得(y²-x²)/x²y²所以(x-y分之x+...