Question

Am nevoie mă puteți ajuta la cele trei probleme

Answer 1

3.
a+b+c+d=88 tone
a+5=b-3=c/5=5d
b=a+5+3=a+8
c=5×(a+5) =5a+25
d=(a+5)/5=a/5 +1
a+a+8+5a+25+a/5+1=88
7a+a/5+34=88
7a+a/5=54
35a+a=270
36a=270
a=270:36=7,5 tone
b=a+8=7,5+8=15,5 tone
c=5a+25=7,5×5+8=62,5 tone
d=a/5 +1=7,5/5 +1=2,5 to

4.
Vcutie=8³=512 cm³
80,32 si 40 sunt multipli de 8
Vcutie paralelipipedica=80×32×40=102400 cm³
nr cutii sub forma de cuburi cu latura de 8 cm =102400:512=200 cutii


5.
a=kg cutia 1 
a=kg cutia 2 
2a=kg cutia 3
a+2a=21 kg
3a=21
a=7 kg cantareste cutia 1  
a=7 kg cantareste cutia 2
 2a=7×2=14 kg cantareste cutia 3