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(1+2+3+....+50)•x-123,4=3701,6.
aflati x.


Răspuns :

50 X 51
---------- X x = 3701,6 + 123,4
     2

1275 X x = 3825

x = 3825 : 1275

x = 3
50*51/2 * x = 3701,6 - 123,4
25*51*x = 3578,2
x = 3578,2 / 1275 
x = 2,8064313....