四十二分之十九乘46?(四十二乘以九十八的简便算法)
四十二分之十九乘郑郑顷46
=19/42×42+19/42×4
=19+38/21
=19+1又19/丛销21
=20又喊陆19/21

tags:
四十二分之十九乘郑郑顷46
=19/42×42+19/42×4
=19+38/21
=19+1又19/丛销21
=20又喊陆19/21
