a) x = 0,4
y = 5 · 0,4 + 18
y = 20
б) y = 3
3 = 5x + 18
-5x = 18 - 3
-5x = 15
x = -3
в) C(-6 ; -12)
y = 5 · (-6) + 18
y = -30 + 18
y = -12
Проходит.
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Определите пропущенные числа и найдите сумму:
1+1+2+3+5+...+144=?