Question

dau coroana si 50 de puncte.

Answer 1

1 Fie a si b cele 2 numere
a+b=1854
a=2b
2b+b=1854=>3b=1854=>b=1854:3=>b=618
a=2b=>a=2×618=>a=1236

2 Fie x si y cele 2 numere
(x+y)/2=9,5=>x+y=19
x=6,2
x+y=19=>6,2+y=19,00=>y=19,00-6,2=>y=12,70

3 Fie a si b cele 2 numere.
a+b=182,5
a-b=18,17=>a=18,17+b
a+b=182,50=>18,17+b+b=182,50=>2b=182,50-18,17=>2b=164,33=>b=82,165
a=82,165+18,170=>a=100,335

Answer 2

1) 
a + 2a = 18,54 
3a = 18,54 
a = 18,54 : 3 
a = 6,18 - numarul 

2) 
(6,2 + a) :2 = 9,5 
6,2 + a = 9,5 x 2 
6,2 + a = 19 
a = 19 - 6,2 
a = 12,8  - numarul 

3)
a+b = 182,5 
a -b = 18,17
a = 18,17+b

18,17 +b +b = 182,5
18,17 +2b = 182,5 
2b = 182,5 - 18,17 
2b = 164,33
b = 164,33 : 2
b= 82,165 
a = 82,165 + 18,17 = 100,335 

4)
x - 5,2  <7 
x < 7+5,2
x < 12,2
x ={ 0,1,2,3,4,5,6,7,8,9,10,11,12}

x + 9,5 <=10,5
x < = 10,5 - 9,5
x < = 1 
x = {-inf... 0,1}