（2022 春・师宗县期中）直接写出结果。

\begin{tabular}{llll}
$84 \div 4=$ & $280 \div 7=$ & $3200 \div 8=$ & $50 \times 60=$ \\
$300 \div 5=$ & $25 \times 40=$ & $120 \div 2=$ & $33 \times 30=$ \\
$31 \times 42 \approx$ & $138 \div 7 \approx$ & $346 \div 5 \approx$ & $69 \times 71 \approx$
\end{tabular}
解答】解:

\begin{tabular}{llll}
$84 \div 4=21$ & $280 \div 7=40$ & $3200 \div 8=400$ & $50 \times 60=3000$ \\
$300 \div 5=60$ & $25 \times 40=1000$ & $120 \div 2=60$ & $33 \times 30=990$ \\
$31 \times 42 \approx 1200$ & $138 \div 7 \approx 20$ & $346 \div 5 \approx 70$ & $69 \times 71 \approx 4900$
\end{tabular}