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10.11.2020 •
Mathematics
1a+2b+3c=17 2a-2b+4c=20 4a+1b-4c=-3 elimination find all variables
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Ответ:
set quadratic equations and use the pythagorean identity (21-x)^2+(42-X) ^2=(45-x)^2
expand and distribute both sides to get quadratic equation x^2-36x+180=0, and find x to be 6cm