Question

Tính nhanh :

2^3 .3^2.28+2^3.3^5.8

Answer 1

\(2^3.3^2.28+2^3.3^5.8\\ =2^3.3^2.2^2.7+2^3.3^5.2^3\\ =2^5.3^2.7+2^6.3^5\\ =2^5.3^2\left(7+2.3^3\right)\\ =32.9\left(7+54\right)\\ =32.9.61=17568\)

Answer 2

\(2^3.3^2.28+2^3.3^5.28\)

=> \(28.(2^3.3^2+2^3.3^5)\)

=> \(28.[3^3(3^2+3^5)]\)

=> \(28.[3^3.252]\)

=> ............( tự tính)