What should come in place of the question mark (?) in the following questions ?
38.734 + 8.638 - 5.19 = ?
$$7^{8.9} \div (343)^{1.7} \times (49)^{4.8} = 7^{?}$$
$$\sqrt[3]{512}+\sqrt[4]{16}+\sqrt{576}=?$$
(42 $$\times$$ 3.2) $$\div$$ (16 $$\times$$ 1.5) = ?
$$199 + 5^{3} \div 4 \times 4^{2} = ?$$
342 $$\div$$ 6 $$\times$$ 28 = 1099 + ?
$$\frac{9.8 \times 2.5 \times 7.6}{0.5}=?$$
3/5 of 2/7 of ? =426
3/5 of 2/7 of ? =426
13/63 $$\div$$ 104/14 $$\times$$ 52/19