gải giúp mình nhé! a) (-10/3)^5 . (-6/4)^4 b) 12^3+3.12^3+3^2 03/09/2021 Bởi Nevaeh gải giúp mình nhé! a) (-10/3)^5 . (-6/4)^4 b) 12^3+3.12^3+3^2
Đáp án: Giải thích các bước giải: `a) (-10/3)^5 . (-6/4)^4` `= (100 000)/243 . 81/16` `= 2108.96224 ≈ 2109` `b) 12^3+3.12^3+3^2` `= 12^3(1+3) + 3^2` `= 1728 . 4 + 9` `= 6921` *, theo yêu cầu làm thêm `(12^3+3.12^3+3^2)/162` `= 6921/162` `= 769/18` Bình luận
$\left ( -\dfrac{10}{3} \right )^{5}.\left ( -\dfrac{6}{4} \right )^{4}\\=-\left ( \dfrac{10}{3} \right )^{5}.\left ( \dfrac{6}{4} \right )^{4}\\=-\left ( \dfrac{10}{3} \right )^{5}.\left ( \dfrac{3}{2} \right )^{4}\\=-\dfrac{10}{3}.5^{4}\\=-\dfrac{10.5^{4}}{3}\\=-\dfrac{10.625}{3}=-\dfrac{6250}{3}\\b) 12^{3}+3.12^{3}+3^{2}\\=4.12^{3}+9\\=4.1728+9\\=6912+9=6921$ Bình luận
Đáp án:
Giải thích các bước giải:
`a) (-10/3)^5 . (-6/4)^4`
`= (100 000)/243 . 81/16`
`= 2108.96224 ≈ 2109`
`b) 12^3+3.12^3+3^2`
`= 12^3(1+3) + 3^2`
`= 1728 . 4 + 9`
`= 6921`
*, theo yêu cầu làm thêm
`(12^3+3.12^3+3^2)/162`
`= 6921/162`
`= 769/18`
$\left ( -\dfrac{10}{3} \right )^{5}.\left ( -\dfrac{6}{4} \right )^{4}\\=-\left ( \dfrac{10}{3} \right )^{5}.\left ( \dfrac{6}{4} \right )^{4}\\=-\left ( \dfrac{10}{3} \right )^{5}.\left ( \dfrac{3}{2} \right )^{4}\\=-\dfrac{10}{3}.5^{4}\\=-\dfrac{10.5^{4}}{3}\\=-\dfrac{10.625}{3}=-\dfrac{6250}{3}\\b) 12^{3}+3.12^{3}+3^{2}\\=4.12^{3}+9\\=4.1728+9\\=6912+9=6921$