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3x-dlugosc I boku
x-dlugosc II boku
3x-6-dlugosc III boku
3x+x+(3x-6)=71
3x+x+3x-6=71 /+6
7x=77 /:7
x=11[cm] -dlugosc II boku
3x=3*11=33[cm]-dlugosc I boku
3x-6=3*11-6=33-6=27[cm]-dlugosc III boku
Spr. 11cm+33cm+27cm=71cm
Dlugosci bokow tego trojkata to 11cm,33cm i 27 cm ;))