6. Quercus shuwan1-2/27-2/5 = 46/135
Jiuding Tower 135× 2/5 = 54
Shuilianxia 135-54-46 = 35
46÷46/ 135= 135
135÷260=3/8
7. 14÷ 1/3=42 42- 14=28
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1- 1/3=2/3
1+2/3=3/5
260- 10=250
250÷3/5= 150
150×2/3= 100
100+ 10= 1 10