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Polecam się na przyszłość PCTS09
4a = a + 18
4a - a = 18
3a = 18 /:3
a = 6
a² + 5 = 5a(0,2a + 3)
a² + 5 = a² + 15a
a² - a² - 15a + 5 = 0
-15a = -5/:(-15)
a = 1/3
2a-a²+2a+a²=a+18
4a=a+18
3a=18 /:3
a=6
a(kwadrat) + 5 = 5a(0,2a + 3)
a²+5=5a(0,2a+3)
5-15a=0
-15a=-5 /:-15
a=⅓
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