“妙酒”我向你提问,几道数学题.
问题描述：
“妙酒”我向你提问,几道数学题.
8/7-6/7x7/15
36x9/15+36x14/15+36x8/15
答
8/7-6/7x7/15
=8/7-2/5
=40/35-14/35
=26/35
36x9/15+36x14/15+36x8/15
=36x(9/15+14/15+8/15)
=36x31/15
=12x31/5
=372/5 =12x31/5这是什么意思呢？为什么=36x31/15改成了那个呢？9/15+14/15+8/15 =31/15 呀不是，12，哪来的？36x31/15=12x3x31/15=12x31/5