Question

c=(2 ^40+2^39+2^38):7=

Answer 1

Raspunsul in atasament

Answer 2

    
[tex]\displaystyle \\ \frac{2 ^{40}+2^{39}+2^{38}}{7} =\frac{2 ^{38+2}+2^{38+1}+2^{38}}{7} = \\ \\ =\frac{2 ^{38}\times 2^{2}+2^{38}\times 2^{1}+2^{38}}{7} = \\ \\ =\frac{2 ^{38}( 2^{2}+2^{1}+1)}{7} =\frac{7 \times 2 ^{38}}{7} = \boxed{2^{38}}[/tex]