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B. (x² - y²) = (x-y)(x+y)
czyli: x - y = (x² - y²)÷(x+y)
x-y = 14a³÷21a = ⅔a²
C. c= b/a²
c²=b²/a⁴dla a≠0
D. x=1-1/m
x=(m-1)/m dla m≠0