[tex]P=\frac{(a+b)*h}{2} |*2\\2P=(a+b)*h|:h\\\frac{2P}{h} = a+b\\b=\frac{2P}{h} -a[/tex]
[tex]a=\frac{k*s+m}{b} |*b\\ab=k*s+m\\ab-m=k*s|:k\\s=\frac{ab-m}{k}[/tex]
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[tex]P=\frac{(a+b)*h}{2} |*2\\2P=(a+b)*h|:h\\\frac{2P}{h} = a+b\\b=\frac{2P}{h} -a[/tex]
[tex]a=\frac{k*s+m}{b} |*b\\ab=k*s+m\\ab-m=k*s|:k\\s=\frac{ab-m}{k}[/tex]