Question

Tính:

a, \(\frac{37.7+37.3}{74.25-74.10}\) 

b,\(\frac{2^{76}-2^{74}}{2^{78}-2^{76}}\) 

Answer 1

\(\frac{37.7+37.3}{74.25-74.10}=\frac{37.\left(7+3\right)}{74.\left(25-10\right)}=\frac{37.10}{37.2.15}=\frac{10}{30}=\frac{1}{3}\)   

\(\frac{2^{76}-2^{74}}{2^{78}-2^{76}}=\frac{2^{74}.2^2-2^{74}}{2^{76}.2^2-2^{76}}=\frac{2^{74}.\left(2^2-1\right)}{2^{76}.\left(2^2-1\right)}=\frac{2^{74}}{2^{74}.2^2}=\frac{1}{2^2}=\frac{1}{4}\)

Answer 2

kq la 1/4

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