《2025年口算训练六年级数学下册人教版升级版》

用简便方法计算。
$4\times\frac{2}{7}+4\times\frac{5}{7}$
$\frac{31}{32}\times31$
$1.25\times(8 + 10)$
$25\times4.8\times125$
$17.35 - 4.69 - 5.31$
$3.6\times3.1 + 3.6\times5.9 + 3.6$

答案：

$4\times7\times25 =$
$5.76 + 13.57 + 4.24 + 6.43 =$
$41.06 - 19.62 - 20.38 =$
$4 - \frac{5}{11} - \frac{6}{11} =$
$(\frac{1}{6} - \frac{1}{12})\times24 =$
$3000\div8\div125 =$
$\frac{5}{7}\times\frac{3}{7} + \frac{4}{7}\times\frac{5}{7} =$
$\frac{3}{8}\times29 + \frac{3}{8}\times51 =$
$67\times99 + 67 =$
$1.28\times101 - 1.28 =$
$125\times88 =$
$25\times44 =$
$19.68 - (2.87 + 6.68) =$
$4835 - 998 =$
$7\frac{2}{17} + (\frac{5}{19} - \frac{2}{17}) =$
$9999 + 999 + 99 + 9 =$
$102\times56 =$
$49\times49 + 49\times51 =$
$\frac{5}{12} + 0.71 + \frac{7}{12} + 0.29 =$

答案：