Sagot :
Système:
[tex]L = \frac{4}{3}l \\2L+2l=560 \\ \\2(\frac{4}{3}l)+2l=560 \\ \\\frac{8}{3}l+\frac{6}{3}l=560 \\ \\\frac{14}{3}l=560 \\ \\l=\frac{560}{\frac{14}{3}} \\ \\l=560*\frac{3}{14} \\ \\l=\frac{1680}{14} \\ \\l=120 \\ \\ \\L = \frac{4}{3}l \\ \\L = \frac{4}{3}120 \\ \\L=160 \\ \\ \\Verification: \\ \\2L+2l = 2*160 + 2 * 120 = 320 + 240 = 560[/tex]
Le champ fait 160m sur 120m.