苏教版五年级下册数学练习与测试第80页答案
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1: 3/2 3/5 1 1/8 3/4 3/10 2: 5/9+x=5/6 x=5/6--5/9 x=15/18--10/18 x=5/18 x+1/8=3/4 x=3/4--1/8 x=6/8--1/8 x=5/8 x--3/8=5/8 x=5/8+3/8 x=1 3: 1/6+5/6 --1/9+2/9 4: 4/7+1/6--4/7 =4/7--4/7+1/6 =1/6 2--7/9--2/9 =2--﹙7/9+2/9﹚ =2--1 =1 1/4+﹙2/5+3/4﹚ =1/4+3/4+2/5 =1+2/5 =7/5 3/5+7/8+2/5 =3/5+2/3+7/8 =1+7/8 =15/8 7/9--﹙1/9+1/3﹚ =7/9--1/9--1/3 =2/3--1/3 =1/3 5/6--3/10+1/6--7/10 =﹙5/6+1/6﹚--﹙3/10+7/10﹚ =1--1 =0 |
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