Cách làm cho bạn:
a) $(\frac{2}{5}−\frac{1}{3})^{2}=(\frac{1}{15})^{2}=\frac{1}{225}$
b) $(1\frac{1}{2}−1,25)^{3}=(\frac{1}{4})^{3}=\frac{1}{64}$
c) $(\frac{1}{2}+\frac{1}{3})^{2}:(1\frac{1}{2})^{2}=(\frac{5}{6})^{2}:(\frac{3}{2})^{2}=\frac{25}{36}:\frac{9}{4}=\frac{25}{81}$
d) 2:$(\frac{1}{2}−\frac{2}{3})^{3}=2:(\frac{−1}{216})$=−432
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