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49/9 + 81/4 = x do kwadratu
x do kwadratu = 25,65
x = pierwiastek z 25,65
b=4 ½dm
c=?
a²+b²=c²
(2 ⅓dm)²+(4 ½dm)²=c²
c²=5⁴/₉+20¼
c²=25⅚
c=√25⅚