Ta có : \(\dfrac{20}{2^2}+\dfrac{5^9}{5^8}=\dfrac{2.10}{2.2}+5^{9-8}=5+5=10\)
20 : 22 + 59 : 58
⇒ 20 : 4 +5
⇒ 5 + 5
⇒10
20:22+59:5820:22+59:58
=20:4+59−8=20:4+59-8
=5+5=10
\(20:2^2+5^9:5^8\)
\(=5.2^2:2^2+5\)
\(=5.1+5\)
\(=5.\left(1+1\right)\)
\(=5.2\)
\(=10\)