Răspuns :
1) 36×3=108 m | 108×3=324 m de sârmă.
3) 2l+2L =156m
l=L-18m
2(L-18)+2L=2L-36+2L= 4L-36=156
4L=120
L=30m
l=30-18=12 m
1) 36•3•3= 108•3=324
=> Trebuie 324 m de sarma.
2)a+a+1+a+2=60
<=>3a+3=60
60-3=57
=>3a=57
57:3=19
=>a=19
a+1=20
a+2=21
=> Trebuie 324 m de sarma.
2)a+a+1+a+2=60
<=>3a+3=60
60-3=57
=>3a=57
57:3=19
=>a=19
a+1=20
a+2=21