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.
72×5/6 -9
=51(枚)
答:李红有邮票51枚。
4.⑴ 6/5×(1-1/3)
=6/5×2/3
=4/5(升)
答:还剩4/5升。
⑵ 6/5-1/3
=18/15-5/15
=13/15(升)
答:还剩13/15升。
⑶ 6/5×1/3=2/5(升)
答:还剩2/5升。
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