簡算（5/9×7/10-1/3）×6/5

題目：

簡算（5/9×7/10-1/3）×6/5

解答：

(5/9×7/10-1/3) × 6/5
= 2/3×7/10 - 2/5
= 7/15 - 6/15
= 1/15