[tex]d = \frac{xy}{bt} \ \ |\cdot bt\\\\d\cdot bt = xy \ \ |:(d\cdot b)\\\\\boxed{t = \frac{xy}{db}}[/tex]
[tex]f = \frac{ct^{2}}{2} \ \ |\cdot2\\\\ct^{2} = 2f \ \ |:t^{2}\\\\\boxed{c = \frac{2f}{t^{2}}}[/tex]
[tex]\frac{x+c}{b} +a = d \ \ |\cdot b\\\\x+c + ab = db\\\\x = db-ab-c\\\\\boxed{x = b(d-a)-c}[/tex]
[tex]e = \frac{mv^{2}}{2} \ \ |\cdot2\\\\mv^{2} = 2e \ \ |:v^{2}\\\\\boxed{m = \frac{2e}{v^{2}}}[/tex]
