Răspuns:
10.a)
[tex]724 \times 999 = 724 \times (1000 - 1) = 724 \times 1000 - 724 \times 1 = 724000 - 724 = 723.276[/tex]
[tex]380 \times 999 = 380 \times (1000 - 1) = 380 \times 1000 - 380 \times 1 = 380000 - 380 = 379.620[/tex]
[tex]405 \times 999 = 405 \times (1000 - 1) = 405 \times 1000 - 405 \times 1 = 405000 - 405 = 404.595[/tex]
b)
[tex]657 \times 999 = 657 \times (1000 - 1) = 657 \times 1000 - 657 = 657000 - 657 = 656.343[/tex]
[tex]380 \times 999 = 380 \times (1000 - 1) = 380 \times 1000 - 380 = 380000 - 380 = 379.620[/tex]
[tex]678 \times 999 = 678 \times (1000 - 1) = 678 \times 1000 - 678 = 678000 - 678 = 677.322[/tex]
11.
[tex]827 \times 469 = 387.863[/tex]
............ Le mai combini si tu......
20. O sa dau direct raspunsul
a. 89×2×144
b.2×80×94
c.2×113×82
