Tính giá trị các biểu thức sau. b) B = ( 6/25 − 1 , 24 ) : 3/7 : [ ( 3(1/2) − 3(2/3) ) : 1/14 ]

b) $B=(\frac{6}{25}-1,24):\frac{3}{7}:[(3\frac{1}{2}-3\frac{2}{3}):\frac{1}{14}]$

$=(\frac{6}{25}-\frac{31}{25}):\frac{3}{7}:[(\frac{7}{2}-\frac{11}{3}):\frac{1}{14}]$

$=(-1):\frac{3}{7}:[(\frac{21}{6}-\frac{22}{6}).14]$

$=\frac{-7}{3}:[\left(\frac{-1}{6}\right).14]=\frac{-7}{3}:\left(\frac{-7}{3}\right)$

$=\frac{7}{3}.\frac{3}{7}=1$