Toán Lớp 6: Tính
(5/7+5/14+5/21)/(10/7+10/14+10/21)
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Toán Lớp 6: Tính
(5/7+5/14+5/21)/(10/7+10/14+10/21)
Comments ( 2 )
=[5(1/7+1/14+1/21)]/[10(1/7+1/14+1/21)]
=[5(1/7+1/14+1/21)]/[5.2(1/7+1/14+1/21)]
=[\cancel{5}.1.\cancel{(1/7+1/14+1/21)}]/[\cancel{5}.2.\cancel{(1/7+1/14+1/21)}]
=1/2
$=\dfrac{\dfrac{5}{7}+\dfrac{5}{14}+\dfrac{5}{21}}{2.(\dfrac{5}{7}+\dfrac{5}{14}+\dfrac{5}{21})}$
$=\dfrac{1}{2}$