第106页 - 江苏版实验班提优训练数学六年级上下册答案

A

$=\frac{2}{5}-\frac{1}{3}$

$=\frac{6}{15}-\frac{5}{15}$

$=\frac{1}{15}$

$=\frac{25}{24}+\frac{5}{24}$

$=\frac{30}{24}$

$=\frac{5}{4}$

$=2 \frac {7}{13}×\frac{1}{7}+\frac {1}{7}×\frac {6}{13}$

$=\frac {1}{7}×(2 \frac {7}{13}+\frac {6}{13})$

$=\frac{1}{7}×3$

$=\frac{3}{7}$

$=\frac {17}{18}×36-\frac {3}{4}×36+\frac {1}{6}×36$

$=34-27+6$

$=7+6$

$=13$

$\frac{5}{2}$

24

30

3:7

90

3

$\frac{4}{5}×3÷\frac{3}{10}=8(杯)$

$答：3盒这样的果汁可以倒满8杯。$

$小班:300×\frac{4}{4+5+6}=80(个)\ $

$中班:300×\frac{5}{4+5+6}=100(个)\ $

$大班:300×\frac{6}{4+5+6}=120(个)$

$答：大班分得120个,中班分得100个,小班分得80个。$

$\ =(1-\frac{1}{2})+(\frac{1}{2}-\frac{1}{4})+(\frac{1}{4}-\frac{1}{8})+(\frac{1}{8}-\frac{1}{16})$

$+(\frac{1}{16}-\frac{1}{32})+(\frac{1}{32}-\frac{1}{64})+(\frac{1}{64}-\frac{1}{128})\ $

$=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{4}+\frac{1}{4}-\frac{1}{8}+\frac{1}{8}-\frac{1}{16}+\frac{1}{16}-\frac{1}{32}$

$+\frac{1}{32}-\frac{1}{64}+\frac{1}{64}-\frac{1}{128}\ $

$=1-\frac{1}{128}\ $

$=\frac{127}{128}$

$=2022÷\frac{2022×2023+2022}{2023}$

$=2022×\frac{2023}{2022×2023+2022}$

$=2022×\frac{2023}{2022×(2023+1)}$

$=\frac{2023}{2024}$