Question

dau coroană urgent va rog

Answer 1

2 .a perimterul = 6*2cm + 4*2cm= 20 cm
   b aria = 6cm*4cm= 24cm patrati
3 .  2L+2l=40cm
     L= 3l ==>6l+2l=40==> 8l=40==>l=5cm==L=3*5=15 cm
     rezulta ca aria este 5*15=75 cm patrati
4.volumul paralelipipedului=2*4*8=64dm cubi
   volumul cutiilor= 20 la puterea a treia = 8000cm cubi =8 dm cubi
  64:8=8 cutii incap in paralelipiped
5. V=100cm cubi
    100cm cubi=5*2*x
    10cm cubi=x
h=inaltimea=x

Answer 2

2.a) L = 0,6*10 = 6 cm
  Perim = 2(6+4) = 20 cm   ;   Aria = 6 * 4 = 24 cm^2
  b)Perim = 4*5 = 20         ;    Aria = 5*5 = 25  cm^2
3. 2L +2l = 40   =>  2*3*l + 2*l  = 8*l  = 40  => l = 5
   L = 3*l = 3*5 = 15
  Aria = 15 * 5 = 75  cm^2
4. Vol bax  = 20 cm * 40 cm * 80 cm  = 64000 cm^3
    Vol cutie = 20*20*20 = 8000 cm^3
    Nr.cutii = 64000/8000 = 8 cutii in bax
5.   Vol = 5*2*h = 100 =>  h = 10