rút gọn các p/s sau: a) -21.18/-24.35 b) 15∧7 . 2∧5 / 3∧6 . 5∧8 . 2∧4 c) 2∧9 . 5∧3 . 3∧4 / 5∧2 . 3∧5 . 2∧7 Làm ơn hãy giúp mình vơi. cảm ơn rất nhiều ∧ ∧ ∧ ∧ ∨ ∨ ∧ ∧ ∧ ∧
1 câu trả lời
Đáp án:
$\begin{array}{l}
a)\dfrac{{ - 21.18}}{{ - 24.35}}\\
= \dfrac{{3.7.18}}{{3.8.5.7}}\\
= \dfrac{{18}}{{8.5}}\\
= \dfrac{9}{{4.5}}\\
= \dfrac{9}{{20}}\\
b)\dfrac{{{{15}^7}{{.2}^5}}}{{{3^6}{{.5}^8}{{.2}^4}}}\\
= \dfrac{{{3^7}{{.5}^7}{{.2}^5}}}{{{3^6}{{.5}^8}{{.2}^4}}}\\
= \dfrac{{3.2}}{5}\\
= \dfrac{6}{5}\\
c)\dfrac{{{2^9}{{.5}^3}{{.3}^4}}}{{{5^2}{{.3}^5}{{.2}^7}}}\\
= \dfrac{{{2^2}.5}}{3}\\
= \dfrac{{20}}{3}
\end{array}$