viết tất cả các phân số bằng phân số 2/5 mà tử số và mẫu số là các số có 2 chữ số
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a) \(\dfrac{-12}{16}=\dfrac{-15}{20}=\dfrac{-18}{24}=\dfrac{-21}{28}=\dfrac{-24}{32}=\dfrac{-27}{36}=\dfrac{-30}{40}=\dfrac{-33}{44}=\dfrac{-36}{48}=\dfrac{-39}{52}\)
\(=\dfrac{-42}{56}=\dfrac{-45}{60}=\dfrac{-48}{64}=\dfrac{-51}{68}=\dfrac{-54}{72}=\dfrac{-57}{76}=\dfrac{-60}{80}=\dfrac{-63}{84}=\dfrac{-66}{88}=\dfrac{-69}{92}\)
\(=\dfrac{-72}{96}=\dfrac{-75}{100}\)
a) − 7 10 = − 14 20 = − 21 30 = − 28 40 = − 35 50 = − 42 60 = − 49 70 = − 56 80 = − 63 90
b) 5 − 8 = 15 − 24 = 25 − 40 = ... = 95 − 152
\(\dfrac{2}{5}=\dfrac{10}{25}=\dfrac{12}{30}=\dfrac{14}{35}=\dfrac{16}{40}=\dfrac{18}{45}=\dfrac{20}{50}=\dfrac{22}{55}=\dfrac{24}{60}=\dfrac{26}{65}=\dfrac{28}{70}=\dfrac{30}{75}=\dfrac{32}{80}=\dfrac{34}{85}=\dfrac{36}{85}=\dfrac{38}{90}=\dfrac{40}{95}\)