Try to judge: are triangles with 2n & # 178; + 2n, 2n + 1,2n & # 178; + 2n + 1 sides right triangles? N is greater than 0

(2n & \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\= (2n & # 178; + 2n) & # 178; + (2n + 1) & # 178; so

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1. Summation of the fifth series is a compulsory course in mathematics of grade one in senior high school The general term formula of sequence {an} is an = (- 1) ^ (n-1) * (4n-3), and the sum of its first n terms can be obtained It must be adopted in time. Please use the multiply common ratio dislocation subtraction method
2. The triangle whose three sides are 2n2 + 2n, 2n + 1, 2n2 + 2n + 1 (n is a positive integer) is () A. Acute triangle B. right triangle C. pure triangle D. acute or right triangle
3. There are two points a and B on the flat ground. A is to the east of mountain D, B is to the southeast of mountain D, and 300 meters in the direction of 25 ° south by west of A. the elevation of C on the top of mountain a is 30 degrees, so as to calculate the mountain height
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7. Calculate 1 + (1 + 2) + (1 + 2 + 3) + +（1+2+3+… +n）．
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14. 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10.97 + 98 + 99 + 100 =? Gauss's solution
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