(30:27-1\3)*2 1\7+2\5
(30÷27-1/3)×2^1/7+2/5=(1^3/27-1/3)×15/7+2/5=(30/27-1/3)×15/7+2/5=7/9×15/7+2/5=5/3+2/5=31/15=2^1/15