面粉厂运进200吨面粉记作+200,那么运出50吨面粉记作______.
“运进”与“运出”相对,所以,若运进200吨面粉记作+200,那么运出50吨面粉应记作-50.
当x=______时,x(x-8)的值与-16的值相等.
I walked slowly through the market, where people () all kinds of fruits and vegetables: I studied the prices carefully and bought what I needed.
A. sell
B. were selling
C. had sold
D. have sold