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1.
6/11×9/8+9/8×5/11
=9/8×(6/11+5/11)
=9/8×1
=9/8
(8－6/13－7/13)×2/7
=[8－(6/13+7/13)]×2/7
=[8－1]×2/7
=7×2/7
=2
(5/6+3/4)×12
=5/6×12+3/4×12
=10+9
=19
4/7×1/6+3/7÷6
=4/7×1/6+3/7×1/6
=1/6×(4/7+3/7)
=1/6×1
=1/6
2.
360×2/9+360×1/4
=170（米）
答：两周一共修了170米。
3.
72×5  | 