1)8 5/9 + 3 5/6
2)12 5/12 - 8 7/18
3)5 11/12 - 2 1/6 - 1 1/4
4)2 7/9 - 1 5/18 + 5 1/2
5)1/2×4/7
2)12 5/12 - 8 7/18
3)5 11/12 - 2 1/6 - 1 1/4
4)2 7/9 - 1 5/18 + 5 1/2
5)1/2×4/7
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Answers & Comments
1) ＝77/9 + 23/6 ＝ 77*2 /9*2 + 23*3 /6*3 ＝ (154 + 69) / 18 ＝223/18 ＝ 12 7/18
2) ＝149/12 - 151/18 ＝(149*3 - 151*2)/36 ＝145/36 ＝4 1/36
3) ＝71/12 - 13/6 - 5/4 ＝(71 - 13*2 - 5*3)/12 ＝(71 - 26 - 15)/12 ＝ 30/12 ＝ 2 1/2
4) ＝25/9 - 23/18 + 11/2 ＝ (25*2 - 23 + 11*9)/18 ＝(50 - 23 + 99)/18 ＝ 126/18 ＝7
5) 1/2 * 4/7 ＝ (1*4)/(2*7) ＝ 2/7