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b)
c)
liczę na naj
M
15² + 20² = x²
225 + 400 = x²
625 = x²
25 = x
b/
(-3/5)^2+(-4/5)^2=9/25+16/25=25/25=1
x=1
c/
6^2+9^2=36+81=117=√117