来自胡冀的问题
化简(1÷a-b-1÷a+b)÷ab÷a²-b²化简(1÷a-b)-(1÷a+b)÷ab÷a²-b²
化简(1÷a-b-1÷a+b)÷ab÷a²-b²
化简(1÷a-b)-(1÷a+b)÷ab÷a²-b²
1回答
2020-09-19 01:28
化简(1÷a-b-1÷a+b)÷ab÷a²-b²化简(1÷a-b)-(1÷a+b)÷ab÷a²-b²
化简(1÷a-b-1÷a+b)÷ab÷a²-b²
化简(1÷a-b)-(1÷a+b)÷ab÷a²-b²
是这个吗
[1/(a-b)-1/(a+b)]÷(ab/(a²-b²))
=(a+b-a+b)/[(a+b)(a-b)]÷ab/[(a+b)(a-b)]
=2b/ab
=2/a(即2÷a)