81又1/7*7/8+71又1/6*6/7+61又1/5*5/6+51又1/4*4/5

81又1/7*7/8+71又1/6*6/7+61又1/5*5/6+51又1/4*4/5
81又1/7*7/8+71又1/6*6/7+61又1/5*5/6+51又1/4*4/5

81又1/7*7/8+71又1/6*6/7+61又1/5*5/6+51又1/4*4/5
81又1/7*7/8+71又1/6*6/7+61又1/5*5/6+51又1/4*4/5
=(80+8/7)x7/8+(70+7/6)x6/7+(60+6/5)x5/6+(50x5/4)x4/5
=70+1+60+1+50+1+40+1
=224
如果本题有什么不明白可以追问,

秒酒回答正解

81又1/8+71又1/7……+51又1/5=81+71+61+51+1/8+1/7+1/6+1/5=264又533/840