Toán 27 phần 23 + 5 phần 21 – 4 phần 23 + 16 phần 21 + 1 phần 2 Giúp mik vs 15/09/2021 By Ivy 27 phần 23 + 5 phần 21 – 4 phần 23 + 16 phần 21 + 1 phần 2 Giúp mik vs
Ta có $\dfrac{27}{23} + \dfrac{5}{21} – \dfrac{4}{23} + \dfrac{16}{21} + \dfrac{1}{2} = \dfrac{27}{23} – \dfrac{4}{23} + \dfrac{5}{21} + \dfrac{16}{21} + \dfrac{1}{2}$ $= \dfrac{27-4}{23} + \dfrac{5+16}{21} + \dfrac{1}{2}$ $= \dfrac{23}{23} + \dfrac{21}{21} + \dfrac{1}{2}$ $= 1 + 1 + \dfrac{1}{2} = \dfrac{5}{2}$ Trả lời
Ta có
$\dfrac{27}{23} + \dfrac{5}{21} – \dfrac{4}{23} + \dfrac{16}{21} + \dfrac{1}{2} = \dfrac{27}{23} – \dfrac{4}{23} + \dfrac{5}{21} + \dfrac{16}{21} + \dfrac{1}{2}$
$= \dfrac{27-4}{23} + \dfrac{5+16}{21} + \dfrac{1}{2}$
$= \dfrac{23}{23} + \dfrac{21}{21} + \dfrac{1}{2}$
$= 1 + 1 + \dfrac{1}{2} = \dfrac{5}{2}$