Linxiang No.6 Middle School Junior High School 201June 2 Math Week Zhou Qing Answer

Given that α is an acute angle and Tan (90-α) =, the degree of α is ().

A.30

b45

C.60

Cao 75

Answer a

10 bag of wheat is calculated as per bag 150 kg. The number of kilograms exceeded is positive, and the number of kilograms insufficient is recorded.

Negative numbers, respectively: -6, -3,-1, -2, +7, +3, +4, -3, -2,+1, compared with the standard mass,

How many kilograms is this 10 bag of wheat over or under? What is the total mass of 10 bag of wheat? The plane of each bag of wheat

How many kilograms is the average mass?

answer

149.8