Question

1/6x2/3÷(4/5一())=5/12,括号里应填什么数?

Answer 1

1/6x2/3÷(4/5一())=5/12
1/9÷(4/5一())=5/12
(4/5一())=1/9÷5/12
(4/5一())=1/9x12/5
4/5-()=4/15
()=8/15