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一、简便计算下面各题。
$\frac{5}{12} \times \frac{1}{13} - \frac{1}{4} \div 13$ $2.5 + 5.02 + 4.98 + 8.5$ $3.74 - 1.8 \times 0.25 - 0.55$
$326 - 2680 \div 67 - 126$ $\frac{1}{5} \times \frac{5}{13} + \frac{4}{13} \div 5$ $\frac{13}{49} \times 21 + 13 \times \frac{28}{49}$
$3 - \frac{10}{21} \times \frac{3}{2} - \frac{2}{7}$ $\frac{7}{16} \times 43 - \frac{7}{16} \div \frac{1}{11}$ $200 \div 25 + 4.54 + 5.46$
$3.72 \times 99 + 3.72$ $\frac{1}{25} \times \frac{3}{7} + \frac{4}{7} \div 25$ $8 \times 0.4 \times 12.5\% \times 2.5$
$768 \times 103 - 76.8 \times 30$ $\frac{29}{13} - (\frac{3}{13} + \frac{5}{7}) - \frac{2}{7}$ $7.5 \times 4.65 + 4.35 \times 7.5 + 7.5$
$\frac{5}{12} \times \frac{1}{13} - \frac{1}{4} \div 13$ $2.5 + 5.02 + 4.98 + 8.5$ $3.74 - 1.8 \times 0.25 - 0.55$
$326 - 2680 \div 67 - 126$ $\frac{1}{5} \times \frac{5}{13} + \frac{4}{13} \div 5$ $\frac{13}{49} \times 21 + 13 \times \frac{28}{49}$
$3 - \frac{10}{21} \times \frac{3}{2} - \frac{2}{7}$ $\frac{7}{16} \times 43 - \frac{7}{16} \div \frac{1}{11}$ $200 \div 25 + 4.54 + 5.46$
$3.72 \times 99 + 3.72$ $\frac{1}{25} \times \frac{3}{7} + \frac{4}{7} \div 25$ $8 \times 0.4 \times 12.5\% \times 2.5$
$768 \times 103 - 76.8 \times 30$ $\frac{29}{13} - (\frac{3}{13} + \frac{5}{7}) - \frac{2}{7}$ $7.5 \times 4.65 + 4.35 \times 7.5 + 7.5$
答案
$\frac{1}{78}$ 21 2.74
160 $\frac{9}{65}$ 13
2 14 18
372 $\frac{1}{25}$ 1
76800 1 75
160 $\frac{9}{65}$ 13
2 14 18
372 $\frac{1}{25}$ 1
76800 1 75
