Question

$$\left. \begin{array} { l } { \frac { 2 } { 16 } + 14 } \\ { ( 15 + 32 \div 2 \times 5 ) \div 75 } \\ { ( 15 \times 32 \div 2 \times 5 ) \div 75 } \\ { ( 480 \div 2 \times 5 } \end{array} \right.$$

Answer

214*10800/75;1200/75;2480/2*5

Solution


Use this rule: \(\frac{a}{b} \times \frac{c}{d}=\frac{ac}{bd}\).
\[\begin{aligned}&214\times \frac{\frac{15\times 32\times 45}{2}}{75}\\&\frac{15\times \frac{32}{2}\times 5}{75}\\&\frac{2480}{2}\times 5\end{aligned}\]
Simplify  \(15\times 32\)  to  \(480\).
\[\begin{aligned}&214\times \frac{\frac{480\times 45}{2}}{75}\\&\frac{15\times \frac{32}{2}\times 5}{75}\\&\frac{2480}{2}\times 5\end{aligned}\]
Simplify  \(480\times 45\)  to  \(21600\).
\[\begin{aligned}&214\times \frac{\frac{21600}{2}}{75}\\&\frac{15\times \frac{32}{2}\times 5}{75}\\&\frac{2480}{2}\times 5\end{aligned}\]
Simplify  \(\frac{21600}{2}\)  to  \(10800\).
\[\begin{aligned}&214\times \frac{10800}{75}\\&\frac{15\times \frac{32}{2}\times 5}{75}\\&\frac{2480}{2}\times 5\end{aligned}\]
Use this rule: \(\frac{a}{b} \times \frac{c}{d}=\frac{ac}{bd}\).
\[\begin{aligned}&214\times \frac{10800}{75}\\&\frac{\frac{15\times 32\times 5}{2}}{75}\\&\frac{2480}{2}\times 5\end{aligned}\]
Simplify  \(15\times 32\)  to  \(480\).
\[\begin{aligned}&214\times \frac{10800}{75}\\&\frac{\frac{480\times 5}{2}}{75}\\&\frac{2480}{2}\times 5\end{aligned}\]
Simplify  \(480\times 5\)  to  \(2400\).
\[\begin{aligned}&214\times \frac{10800}{75}\\&\frac{\frac{2400}{2}}{75}\\&\frac{2480}{2}\times 5\end{aligned}\]
Simplify  \(\frac{2400}{2}\)  to  \(1200\).
\[\begin{aligned}&214\times \frac{10800}{75}\\&\frac{1200}{75}\\&\frac{2480}{2}\times 5\end{aligned}\]