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2N = x+1
(x)²-(x+1)²=25
X²-(x²+2x+1)=25
X²-x²-2x-1=25
-2x=26
X=26/-2= x - 13
1N = - 13 __ 2N = 1-13= - 12
(-13)²-(-12)²= 169-144=25
B) es
10/3 + 3/10 = 109/10
Porque
10/3 y su inversa es 3/10
Y queda
10/3 + 3/10 = 109/10