Đáp án:
Giải thích các bước giải:
\[\begin{array}{l}
5m\,6cm = 50dm + 0,6dm = 50,6dm\\
5,37{m^2} = 5000000m{m^2} + 370000m{m^2} = 5370000m{m^2}\\
2\frac{3}{4}h = 120' + \frac{3}{4} \times 60' = 120' + 45' = 165'\\
4384m = 4km\,384m\\
\frac{2}{4} + \frac{2}{3} + \frac{5}{{12}} = \frac{{6 + 8 + 5}}{{12}} = \frac{{19}}{{12}}\\
\frac{3}{5} \times \frac{2}{7} \times \frac{5}{6} = \frac{{3 \times 2 \times 5}}{{5 \times 7 \times 3 \times 2}} = \frac{1}{7}\\
\frac{7}{8} - \frac{7}{{16}} - \frac{{11}}{{12}} = \frac{{42 - 21 - 44}}{{48}}\\
\frac{{15}}{{16}}:\frac{3}{8} \times \frac{3}{4} = \frac{{15}}{{16}} \times \frac{8}{3} \times \frac{3}{4} = \frac{{5 \times 3 \times 4 \times 2 \times 3}}{{8 \times 2 \times 3 \times 4}} = \frac{{5 \times 3}}{8} = \frac{{15}}{8}\\
x + 35 = 472 + 228\\
x + 35 = 700\\
x = 700 - 35\\
x = 665\\
800 - x + 300 = 136:2\\
800 - x + 300 = 68\\
800 - x = 68 - 300\\
x = 800 - 68 + 300\\
x = 1032
\end{array}\]
