In the leveling between two points a and b on the opposite sides of a pond, the level is first set up near the point a and staff reading on a and b are 2.5 m and 2.0 m respectively. Then the level is moved and set near the point b, staff reading on points a and b are 1.2 m and 1.7 m respectively. Calculate the difference of heights between the two points a and b (in metre)
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7-8:75+9864688+8--(987-&&5
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