10 machine parts blank, the weight of each blank is 200kg, more than 200kg is positive, less than 200kg is negative. The weighing records are as follows: 5.0,-15,6,14,0,-5,8, 18. Calculate the total mass of these parts blanks. (process)

= 200 x 10+5- 15+6+ 14+0-5-8+ 18- 13+ 15

=20 17(qk)

Based on the sea level, the average height of Beijing is 43.7m, the average height of Shanghai is 4m, and the lowest point of Turpan Basin is-155 m Q: How much higher is Shanghai than Beijing? How much higher is Beijing than the lowest point in Turpan Basin?

Shanghai is higher than Beijing: 4-43.7=-39.7 (m)

Beijing is 43.7-(-155) =198.7 (m) higher than the lowest point in Turpan basin.