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a) 'a' ze wzoru S=at²/2
S=at²/2 / *2
2S=at² / :t²
a = 2S/t²
b) 'a' ze wzoru P=a+b/2 ×h
P = (a+b)h/2 / *2
2P = (a+b)h / :h
2P/h = a+b / -b
a = 2P/h - b