第75页 - 江苏版实验班提优训练数学六年级上下册答案

C

A

C

$=\frac{3}{7}×7-\frac{7}{12}-\frac{5}{12}$

$=3-(\frac {7}{12}+\frac {5}{12})$

$=3-1$

$=2$

$=\frac {3}{19}+\frac {2}{17}+\frac {15}{17}$

$=\frac {3}{19}+(\frac {2}{17}+\frac {15}{17})$

$=\frac {3}{19}+1$

$=1\frac{3}{19}$

$450-450×\frac{1}{5}=360(棵)$

$答：实际培养了360棵。$

$\frac{9}{8}×\frac{1}{3}+\frac{1}{2}=\frac{7}{8}(吨)$

$答：两周共吃去大米\frac {7}{8}吨。$

$15÷(\frac{1}{9-1}-\frac{1}{11-1})=600(克)\ $

$600×\frac{1}{11-1}+600=660(克) $

$答：玻璃杯内原来有蜂蜜水660克。$