31:1 * 3:2 + 41:1 * 4:3 + 51:1 * 5:4 + 61:1 * 6:5 + 71:1 * 7:6
31:1 * 3:2 + 41:1 * 4:3 + 51:1 * 5:4 + 61:1 * 6:5 + 71:1 * 7:6
=(30+3/2)×2/3+(40+4/3)×3/4+(50+5/4)×4/5+(60+6/5)×5/6)+(70+7/6)×6/7
=30×2/3+3/2×2/3+40×3/4+4/3×3/4+50×4/5+5/4×4/5+60×5/6+6/5×5/6+70×6/7+7/6×6/7
=20+1+30+1+40+1+50+1+60+1+70+1
=276
RELATED INFORMATIONS
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