A little more easy to calculate the fifth grade scores

1,4 / 3-7 / 12 + 9 / 20-11 / 30 + 13 / 42-15 / 56 + 17 / 72-19 / 902,42 / [(2 / 3 + 0.4) * 60 / (131 / 42-33 / 14)] 3,7 / 3 * 4 + 7 / 4 * 5 + 7 / 5 * 6 + 7 / 6 * 74,1-1 / 2-1 / 6-1 / 12-1 / 20-1 / 305,1 + 1 / 2 + 1 / 6 + 1 / 12 + 1 / 20 + 1 / 30? Not enough!

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