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7cm+3cm=10cm dluższa
a=7cm
b=10cm
P=1/2 *a*b
P=1/2 *7cm*10cm=7cm*5cm=35cm² pole trójkąta
b - druga przyprostokatna
a + b = 17
b=a+3
a + a+3 = 17
2*a = 17 - 3
2*a = 14
a = 7
b = 7 + 3 = 10