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salut , help me please​

Salut Help Me Please class=

Răspuns :

Răspuns:

2L+2l=70

L+10=2l

L=2l-10

2(2l-10)+2l=70

4l-20+2l=70

6l-20=70

6l=70+20

6l=90

l=90:6

l=15

L=2×15-10=30-10

L=20