⑴将天平调节平衡.

⑵用天平测出空烧杯的质量为17g，在烧杯中倒入适量的酱油，测出烧杯和酱油的总质量如图甲所示，将烧杯中的酱油全部倒入量筒中，酱油的体积如图乙所示，则烧杯中酱油的质量为____g，酱油的密度为____kg/m3.

⑶小明用这种方法测出的酱油密度会____（偏大/偏小），.

⑷小华不小心将量筒打碎了，老师说只用天平也能测量出酱油的密度.于是小华添加两个完全相同的烧杯和适量的水，设计了如下实验步骤，请你补充完整.

①调好天平，用天平测出空烧杯质量为m₀

②将一个烧杯____，用天平测出烧杯和水的总质量为m₁

③用另一个烧杯装满酱油，用天平测出烧杯和酱油的总质量为m₂

④则酱油的密度表达式ρ= ____（已知水的密度为ρ_水）

⑸小明针对（4）中小华的实验设计进行评估后，认为小华设计的操作过程有不妥之处，你认为该不妥之处是：____.

A

      Every year, millions of Chinese college students from poor families face money problems. These problems have become a major problem of the whole society. Last month, a national(国家的) survey by the Chinese Foundation for Poverty Alleviation(中国扶贫基金会）was held to learn more about their college life. Here are some of results.

(I) The monthly costs for students     (II) Where do they get subsidies(补助金）?

若（2﹣x）²⁰¹⁵=a₀+a₁x+a₂x²+…+a₂₀₁₅x²⁰¹⁵，则$\frac{a_0+a_2+a_4+\cdots +a_{2014}}{a_1+a_3+a_5+\cdots +a_{2015}}$=____