Cách làm cho bạn:
a)$\frac{ 5^{4}4.20^{4}}{25^{5}.4^{5}}=\frac{5^{4}.4^{4}.5^{4}}{5^{10}.4^{5}}=\frac{1}{100}$
b)$\frac{4^{3}.25^{5}.9^{3}}{8^{2}.125^{3}.3^{5}}=\frac{2^{6}.5^{10}.3^{6}}{2^{6}.5^{9}.3^{5}}$=15
c)$\frac{6^{3}+36^{2}+3^{3}}{−13}=\frac{2^{3}.3^{3}+3^{3}.2^{2}+3^{3}}{−13}=\frac{3^{3}(2^{3}+2^{2}+1)}{−13}=−3^{3}$=−27
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