Find the value of $\{(49)^{\frac{3}{2}} + (49)^{\frac{3}{2}}\}$

$47 \frac{1}{17} \div 1 \frac{49}{51} + 23 \frac{5}{7} + ? = 67 \frac{4}{9}$

If $a^{4}+a^{2} b^{2}+b^{4}=8$ and $a^{2}+a b+b^{2}=4,$ then the value of $a b$ is

If $\frac{a^{2}+b^{2}}{c^{2}+d^{2}}=\frac{a b}{c d},$ then find the value of $\frac{a+b}{a-b}$ in terms of $c$ and $d$ only.

What is the value of $\frac{(1.2)^{3}+(0.8)^{3}+(0.7)^{3}-3(1.2)(0.8)(0.7)}{(1.2)^{2}+(0.8)^{2}+(0.7)^{2}-(1.2)(0.8)-(0.8)(0.7)-(0.7)(1.2)}$?

$4 \frac{1}{2} + 3 \frac{1}{6} + x + 2 \frac{1}{3} = 13 \frac{2}{3}$