高一数学计算(初升高衔接)
计算:(x+y+z)(-x+y+z)(x-y+z)(x+y-z)
化简:1.[(x根号x+x根号y)/xy-y²]-[(x+根号xy+y)/(x根号x-y根号y)]
2.[根号a+(b-根号ab)/(根号a+根号b)]/[a/(根号ab+b)+b/(根号ab-a)-(a+b)/根号ab]
当3a²+ab-2b²=0(a≠0,b≠0),求(a/b)-(b/a)-[(a²+b²)/ab]的值