Question

Ce numere pot inlocui A sau B?
a) 5290+a<5295?
b)2350<2356-b?

Answer 1

a)5290 + a < 5295/-5290
a < 5
a apartine $( - \infty$, 5)

b) 2350 < 2356 - b /-2350
0 < 6 - b/+b
b < 6
b apartine $( - \infty$, 6).

Answer 2

a)

5 290 + a < 5 295

a < 5 295 - 5 290

a < 5 ; a ∈ N → numere naturale pentru inv. primar

a = ( 0, 1, 2, 3, 4)

5 290 + 0 < 5 295

5 290 + 1 < 5 295

5 292 < 5 295

5 290 + 3 = 5 293 < 5 295

5 290 + 4 = 5 294 < 5 295

b) 2 350 < 2 356 - b

b < 2 356 - 2 350

b < 6 = > valorile lui b sunt: 0, 1, 2, 3, 4 si 5 → numere naturale

2 350 < 2 356 - 0 = 2 356

2 350 < 2 356 - 1 = 2 355

2 350 < 2 356 - 2 = 2 354

2 350 < 2 356 - 3 = 2 353

2 350 < 2 356 - 4 = 2 352

2 350 < 2 356 - 5 = 2 351