计算:2/15÷(3-2/3)+1/5×3/5最后答案是不是1又8/25

问题描述:

计算:2/15÷(3-2/3)+1/5×3/5
最后答案是不是1又8/25

=2/15÷(7/3)+1/5×3/5
=2/15×3/7+1/5×3/5
=1/5×(2/7+3/5)
=1/5×31/35
=31/175