简便计算 49又21/23除以(-7) (14/15-1.4)除以(-7/30)

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简便计算 49又21/23除以(-7) (14/15-1.4)除以(-7/30)

简便计算 49又21/23除以(-7) (14/15-1.4)除以(-7/30)
简便计算 49又21/23除以(-7) (14/15-1.4)除以(-7/30)

简便计算 49又21/23除以(-7) (14/15-1.4)除以(-7/30)
49又21/23除以(-7)
=49/(-7)+21/23/(-7)
=-7又3/23
(14/15-1.4)除以(-7/30)
=14/10 * 30/7 - 14/15 * 30/7
=2*3 - 2*2
=2

2