Hướng dẫn giải:
a. $\sqrt{16}.\sqrt{25}+\sqrt{196}:\sqrt{49}=4.5+14:7=20+2=22$
b. $36:\sqrt{2.3^{2}.18}-\sqrt{169}=36:\sqrt{18^{2}}-13=36:18-13=-11$
c. $\sqrt{\sqrt{81}}=\sqrt{9}=\sqrt{3^{2}}=3$
d. $\sqrt{3^{2}+4^{2}}=\sqrt{9+16}=\sqrt{25}=5$
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