Cách làm cho bạn:
Ta có:
a) $A=(−0,75−\frac{1}{4}):(−5)+\frac{1}{18}−(−\frac{1}{6}):(−3)$
=$=(−0,75−0,25):(−5)+\frac{1}{18}−\frac{1}{18}$
$=(−1):(−5)=\frac{1}{5}$
b) $B=(\frac{6}{25}−1,24):\frac{3}{7}:[(3\frac{1}{2}−3\frac{2}{3}):\frac{1}{14}]$
=$(\frac{6}{25}−\frac{31}{25}):\frac{3}{7}:[(\frac{7}{2}−\frac{1}{13}):\frac{1}{14}]$
=$(−1):\frac{3}{7}:[(−16):\frac{1}{14}]$
=$(−\frac{7}{3}):(−\frac{7}{3})$
=1
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