Question

Problemele 24,25,26 va rog!!!Ofer 20 puncte​

Answer 1

24) Fie $l$ lungimea initiala a zidului si $L$ lungimea actuala a zidului. Avem ca $L:l=3\text{ rest }2140$.

$L=l+14844\\L:l=3\text{ rest }2140\Rightarrow L=3l+2140\\3l+2140=l+14844\\2l=14844-2140\\2l=12704\\l=12704:2\\l=6352\\L=l+14844=6352+14844=21196\text{ km}$

25) Fie $L$ lungimea marii si $l$ latimea marii.

$P=192\\L=5l\\P=2(l+L)\\192=2(l+5l)\\6l=192:2\\6l=96\\l=96:6\\l=16\text{ km}\\L=5l=5\cdot16=80\text{ km}$

26) Fie $l$ latimea, $L$ lungimea si $a$ adangimea.

$L=460\text{ km}\\l=11a\\l-a=20\\11a-a=20\\10a=20\\a=20:10\\a=2\\l=11a=11\cdot10=110\text{ km}\\L:l=460:110=4\text{ rest }20$