Question

Va rog foarte repede ex. acestea.Am nevoie acum URGENT VA ROG DAU COROANA SI 50 PUNCTE!!!​

Answer 1

2. ab=11×c+5

11×9+5=104 care are trei cifre

11×8+5=93, care este cel mai mare nr de două cifre

3. (1×2×3×4×...×2013+2013)=(1×2×3×...×7×...×2013):7+2013÷7 =1×2×3×...×5×6×8×...×2013+287 rest 4

2013=287×7+4

4. 134=a×b+4

130=a×b

130=1×130=2×65=5×26=10×13

(a,b)€{(1;30),(2;65),(5;26),(10;13)}

5. A=19×5+19×17+22×2

nu știu

6. a-b=509

a=b×57+5

57b+5-b=509

56b=504

b=9

a=518