1乘3分之2减去3乘5分之4加上5乘7分之6ﾁ6￥

1乘3分之2减去3乘5分之4加上5乘7分之6ﾁ6￥8加29乘31分之30

1个回答

乘以3分之4减去3乘以5分之8加上5乘以7分之12减去7乘以9分之16
=4/3 - (4/3 - 4/5) + (6/5 -6/7) - (8/7 - 8/9)
=4/5 + 6/5 - (6/7 + 8/7) + 8/9
=2 - 2 + 8/9
=8/9