(1/15+3/49)*15-1/49 简便计算
5个回答
(1/15+3/49)*15-1/49
=1/15*15+3/49*15-1/49
=1+45/49-1/49
=1+(45/49-1/49)
=1+44/49
=1又44/49
相关问题
(1/15+3/49)*15-45/49能否简便?
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