Question

DACA MA VETI AJUTA
EU CU TOATA INIMA
VA SPUN ASA
EXERCITILE CU SEMNE DE 'T'
MA VETI AJUTA!?? FETE SI BAIETI INTRATI SI SCRIETI REZOLVAREA DEO STI BRE.

Answer 1

T1
x+2/7,5=(19/3)/(1/3)
(x+2)/7,5=19/3:1/3
(x+2)/7,5=19/3·3/1
(x+2)/7,5=19
x+2=19·7,5
x+2=142,5
x=142,5-2
x=140,5

T2
a)2750·20/100=550
b)x·20/100=550
20x/100=550
20x=550·100
x=55000/20
x=2750

T3
15m³--------1000kg
25m³--------x
15/25=x/1000
x=(15·1000)/25
x=600kg

T4
x+y=153.400
{x,y}dp{6,4}
6x=4y=k
6x=k⇒x=k/6
4y=k⇒y=k/4
k/6+k/4=153.400
(2k+3k)/12=153.400
5k=153.400·12
5k=1.840.800
k=1.840.800/5
k=368.160
x=k/6=368.160/6
x=61360
y=k/4=368160/4
y=92040
61360+92040=153400