Dạng 3:
1: 72/14=(72:2)/(14:2)=36/7
2: 990/2610=(990:90)/(2610:90)=11/29
3: \(\dfrac{121212}{424242}=\dfrac{12}{42}=\dfrac{2}{7}\)
4: \(\dfrac{2\cdot\left(-13\right)\cdot9\cdot10}{\left(-3\right)\cdot4\cdot\left(-5\right)\cdot26}=-\dfrac{2\cdot13\cdot9\cdot10}{3\cdot4\cdot5\cdot26}\)
\(=\dfrac{-2\cdot13}{26}\cdot\dfrac{9}{3}\cdot\dfrac{10}{4\cdot5}=-\dfrac{3}{2}\)
5: \(=\dfrac{13\left(5-1\right)}{-13}=-4\)
6: \(=\dfrac{2^4\cdot5^7\cdot11^3}{11^2\cdot5^6\cdot2^4}=5\cdot11=55\)
Đúng 0
Bình luận (0)
