2、Teacher $\mathrm{D}$ has five vases at home, these five vases are arranged in a row from shortest to tallest, the height difference between adjacent vases is 2 centimeters, and the tallest vase is exactly equal to the sum of the heights of the two shortest vases, then the sum of the heights of the five vases is $\qquad$ centimeters
【Answer】50
Analysis: Let the five chimneys be $x-4, x-2, x, x+2, x+4$, then $x+4=x-2+x-4, x=10$, the sum is $5 x=50$