(7/9+3/4-1/6-7/18)÷1/36
=(7/9+3/4-1/6-7/18)×36
=7/9×36+3/4×36-1/6×36-7/18×36
=28+27-6-14
=25
2/5*5/9/(2/5-4/15)
=2/9/(2/15)
=2/9×15/2
=5/3
(7/9+3/4-1/6-7/18)÷1/36
=(7/9+3/4-1/6-7/18)×36
=7/9×36+3/4×36-1/6×36-7/18×36
=28+27-6-14
=25
2/5*5/9/(2/5-4/15)
=2/9/(2/15)
=2/9×15/2
=5/3