问题:
已知2+ =2 2× ,3+ =3 2× ,4+ =4 2× ,…,若10+ =10 2× (a,b为正整数),则分式 =( ).
已知2+ =2 2× ,3+ =3 2× ,4+ =4 2× ,…,若10+ =10 2× (a,b为正整数),则分式 =( ).
参考答案: