wyznacz liczbę x tak, aby srednia arytmetyczna liczb, 12, 25, -2 x wynosiła3
(12 + 25 + (-2) + x) : 4 = 3
12 + 25 + (-2) + x = 3 * 4
37 + (-2) + x = 12
35 + x = 12
x = 12 - 35
x = - 23
załącznik.
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(12 + 25 + (-2) + x) : 4 = 3
12 + 25 + (-2) + x = 3 * 4
37 + (-2) + x = 12
35 + x = 12
x = 12 - 35
x = - 23
załącznik.