Toán Lớp 5: 1 1/21 : (15,75-15 1/4) : 2 1/12 : (7 3/4 – 7,25)
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Toán Lớp 5: 1 1/21 : (15,75-15 1/4) : 2 1/12 : (7 3/4 – 7,25)
Comments ( 1 )
$1\:\dfrac{1}{21\:}:\:\left(15,\:75-15\:\dfrac{1}{4}\right):\:2\:\:\dfrac{1}{12}\::\:\left(7\:\dfrac{3}{4}\:-\:7,\:25\right)$
$=1\:\dfrac{1}{21\:}:\:\left(15,\:75-\:\dfrac{61}{4}\right):\:2\:\:\dfrac{1}{12}\::\:\left(\:\dfrac{31}{4}\:-\:7,\:25\right)$
$=1\cdot \dfrac{1}{21\:}:\:\left(15,\:75-\:\dfrac{61}{4}\right):\:\dfrac{2}{1}\:\cdot \dfrac{1}{12}\::\:\left(\dfrac{31}{4}\:-\:7,\:25\right)$
$=1\cdot \dfrac{1}{21\:}:\:\left(15,\:75-\:\dfrac{61}{4}\right)\cdot \dfrac{1}{2}\:\cdot \dfrac{1}{12}\::\:\left(\dfrac{31}{4}\:-\:7,\:25\right)$
$=1\cdot \dfrac{1}{21\:}:\:\left(15,\:75-\:\dfrac{61}{4}\right)\cdot \dfrac{1}{2}\:\cdot \dfrac{1}{12}\::\:\left(\dfrac{31}{4}\:-\:7,\:25\right)$
$=1\cdot \dfrac{1}{2}\cdot \dfrac{1}{6}\cdot \dfrac{1}{10.5}$
$=1\cdot \dfrac{1\cdot \:1\cdot \:1}{2\cdot \:6\cdot \:10.5}$
$=\dfrac{1\cdot \:\:1\cdot \:\:1}{2\cdot \:\:6\cdot \:\:10,\:5}$
$=\dfrac{1}{2\cdot \:6\cdot \:10.5}$
$=1\cdot \dfrac{1}{126}$
$=0.007…$