Question

1 Tính :

A=(3⁴.5⁷- 9².21)chia cho 3⁵

B=\(\frac{2^9.16+2^8.68}{2^{10}}\)

Answer 1

\(A=\frac{3^4.5^7-9^2.21}{3^5}=\frac{3^4.5^7-3^4.21}{3^5}=\frac{3^4.\left(5^7-21\right)}{3^5}=\frac{78125-21}{3}=\frac{78104}{3}\)

Vậy : \(A=\frac{78104}{3}\)

\(B=\frac{2^9.16+2^8.68}{2^{10}}=\frac{2^9.16+2^8.2.34}{2^{10}}=\frac{2^9.16+2^9.34}{2^{10}}\)

\(=\frac{2^9.\left(16+34\right)}{2^{10}}=\frac{2^9.50}{2^{10}}=\frac{50}{2}=25\)

Vậy :\(B=25\)