(数学)计算

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(数学)计算

(数学)计算
(数学)计算

(数学)计算

2.4=24/10=12/5
原式=(3/5+(12/5)/(2/3))*5/7
=(3/5+(12/5)*(3/2))*5/7
=(3/5+36/10)*5/7
=(6/10+36/10)*5/7
=42/10*5/7
=6/2
=3