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
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
`a)(2^19×16+2^19×34)÷2^19`
`=2^19×(16+34)÷2^19`
`=2^19×50÷2^19`
`=(2^19÷2^19)×50`
`=1×50`
`=50`
`b)(3^4×15-3^4×12)÷3^5`
`=3^4×(15-12)÷3^5`
`=3^4×3÷3^5`
`=3^5÷3^5`
`=1`
`c)(4^3×18+2^7×15)÷2^9`
`=(2^6×18+2^6×2×15)÷2^9`
`=2^6×(18+30)÷2^9`
`=2^6×48÷2^9`
`=(2^6÷2^9)×48`
`=2^(-3)×48`
`=6`
CHÚC BẠN HỌC TỐT!!!