直接写出得数:直接写出得数:① 1/2 + 1/3 = ② 2/5 - 1/6 = ③ 2/5 + 3/8 = ④ 1 - 7/8 = ⑤ 1/4 - 2/7 = ⑥ 3/5 + 2/9 = ⑦ 7/20 + 12/20= ⑧ 1 - 5/11 - 6/11= ⑨ 6 -(1/4 - 1/8)= ⑩ 2/13 + 2/7 + 11/13 =

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直接写出得数:直接写出得数:① 1/2 + 1/3 = ② 2/5 - 1/6 = ③ 2/5 + 3/8 = ④ 1 - 7/8 = ⑤ 1/4 - 2/7 = ⑥ 3/5 + 2/9 = ⑦ 7/20 + 12/20= ⑧ 1 - 5/11 - 6/11= ⑨ 6 -(1/4 - 1/8)= ⑩ 2/13 + 2/7 + 11/13 =
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直接写出得数:直接写出得数:① 1/2 + 1/3 = ② 2/5 - 1/6 = ③ 2/5 + 3/8 = ④ 1 - 7/8 = ⑤ 1/4 - 2/7 = ⑥ 3/5 + 2/9 = ⑦ 7/20 + 12/20= ⑧ 1 - 5/11 - 6/11= ⑨ 6 -(1/4 - 1/8)= ⑩ 2/13 + 2/7 + 11/13 =
直接写出得数:
直接写出得数:① 1/2 + 1/3 = ② 2/5 - 1/6 = ③ 2/5 + 3/8 = ④ 1 - 7/8 = ⑤ 1/4 - 2/7 = ⑥ 3/5 + 2/9 = ⑦ 7/20 + 12/20= ⑧ 1 - 5/11 - 6/11= ⑨ 6 -(1/4 - 1/8)= ⑩ 2/13 + 2/7 + 11/13 =

直接写出得数:直接写出得数:① 1/2 + 1/3 = ② 2/5 - 1/6 = ③ 2/5 + 3/8 = ④ 1 - 7/8 = ⑤ 1/4 - 2/7 = ⑥ 3/5 + 2/9 = ⑦ 7/20 + 12/20= ⑧ 1 - 5/11 - 6/11= ⑨ 6 -(1/4 - 1/8)= ⑩ 2/13 + 2/7 + 11/13 =
1、 1/2 + 1/3 = 5/6
2、 2/5 - 1/6 = 7/30
3、 2/5 + 3/8 = 31/40
4、 1 - 7/8 = 1/8
5、 1/4 - 2/7 = -1/28
6、 3/5 + 2/9 = 37/45
7、 7/20 + 12/20= 19/20
8、1 - 5/11 - 6/11= 0
9、 6 -(1/4 - 1/8)= 47/8即5又7/8
⑩10、2/13 + 2/7 + 11/13 = 9/7 即1又2/7