1: 1/2×1/3=1/6 1/2×2/3=1/3 2: 6/35 1/5 1/6 10/21 3/8 2/5 9/4 48/5 3: ① 不对 5×5/6=25/6 ② 不对 8/21×7/24=1/9
4: 4/7 4 1/4 9/16 2 16/5 1 3/2 5: 1/12×4/5=1/15 1/12×50=25/6 6: 2/15 3/2 3/7 16/3 1/9 3/7 7: 154×10/11 ×4/5=112
8: 48×15/16×10/9=50 9: 120×2/3×2/5=32 10: 40 150 15 35 11: 1/5 1/3 1/2 7/3 1 1/2 12: 900×2/9×4/5=160 13: 39×1/13×2/3=2 |