口算下面各题

\begin{tabular}{llll}
$24 \times 50=$ & $0 \times 290=$ & $(15+5) \times 7=$ & $75+25 \times 4=$ \\
$320 \times 40=$ & $67 \div 67=$ & $125-25 \times 4=$ & $48-48 \div 6=$ \\
$30 \times 170=$ & $27 \times 300=$ & $90 \times 90+10=$ & $60+38 \times 2=$
\end{tabular}
答案】解: $24 \times 50=1200$ $0 \times 290=0$ $(15+5) \times 7=140 \quad 75+25 \times 4=175$ $320 \times 40=12800 \quad 67 \div 67=1$ $125-25 \times 4=25 \quad 48-48 \div 6=40$ $30 \times 170=5100$ $27 \times 300=8100$

$90 \times 90+10=8110$

$60+38 \times 2=136$