Answer:
This is true. For example when \[\text{x}=\text{2}0.\text{86}\]and
\[\text{y }=\text{ 2}0.\text{84},\text{
x}-\text{y}=\text{2}0.\text{86}-\text{2}0.\text{84}=0.0\text{2}\]has only one siginificant
figure, whereas x, y both have four significant figures each. Hence, it is
advisable to measure directly the difference between two nearly equal
quantities instead of measuring the quantities and calculating their
difference.
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