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x² = 3721 - 121 = 3600
x = 60
b. x² = 8² - 7²
x² = 64 - 49 = 15
x = √15
a) b=?
z tw Pitagorasa
b= pierwiastek z (61*61 - 11*11)=60
b) a=?
z tw Pitagorasa
a= pierwiastek z (8*8 - 7*7)=pierwiastek z 15
b)8²-7²=64-49=15=√(15)