Question

Rút gọn

a) 20 - 12 . 20/ -30 - 30 . 10

b) 11^9 . 3^15 . 27/ 3^10 .11^11. 3^8

Answer 1

a: \(=\dfrac{20\left(1-12\right)}{30\left(-1-10\right)}=\dfrac{20}{30}=\dfrac{2}{3}\)

b: \(=\dfrac{11^9\cdot3^{18}}{3^{10}\cdot11^{11}\cdot3^8}=\dfrac{1}{121}\)