tính giá trị biểu thức a, (2^19 . 16 + 2^19 . 34) : 2^19 b,( 3^4 . 15 – 3^4 .12 ) : 3^5 c, (4^3 . 18 + 2^7 . 15) : 2^9

a, (2^19 . 16 + 2^19 . 34) : 2^19

= $2^{19}$ . 16 : $2^{19}$ + $2^{19}$ . 34 : $2^{19}$

= 16 + 34

= 50

b,( 3^4 . 15 – 3^4 .12 ) : 3^5

= ($3^{4}$ . 3 . 5 – $3^{4}$ . 3 . 4) : $3^{5}$

= ($3^{5}$ . 5 – $3^{5}$ . 4) : $3^{5}$

= $3^{5}$ . 5 : $3^{5}$ – $3^{5}$ . 4 : $3^{5}$

= 5 – 5

= 1

c, (4^3 . 18 + 2^7 . 15) : 2^9

= [$(2²)^{3}$ . 2 . 3² + $2^{7}$ . 3 . 5] : $2^{9}$

= ($2^{7}$ . 3² + $2^{7}$ . 3 . 5) : $2^{9}$

= $2^{7}$ . 3(3 + 5) : $2^{9}$

= $2^{7}$ . 3 . 8 : $2^{9}$

= $2^{7}$ . 3 . 2³ : $2^{9}$

= $2^{10}$ . 3 : $2^{9}$

= 2 . 3

= 6