dau coroana si 50 de puncte.

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

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CurrerBell CurrerBell · Answer 2 · 2017-05-07T10:13:41+03:00

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}