第82页 - 江苏版实验班提优训练数学五年级上下册答案

C

D

1

$\frac{11}{7}$

$\frac{11}{15}$

$\frac{6}{5}$

$\frac{2}{9}$

$\frac{3}{16}$

解$：x=\frac {3}{2}-\frac {2}{5}$

$x = \frac {11}{10}$

解$：x=\frac {5}{12}+\frac {3}{8}$

$x = \frac{19}{24}$

解$：x=\frac {11}{12}-\frac {3}{5}$

$x = \frac{19}{60}$

解$：x=\frac {2}{3}-\frac {1}{5}$

$x = \frac{7}{15}$

$=\frac {21}{24}+\frac {8}{24}+\frac {18}{24}$

$=\frac {29}{24}+\frac {18}{24}$

$= \frac {47}{24}$

$=\frac {48}{50}-\frac {15}{50}-\frac {10}{50}$

$=\frac {33}{50}-\frac {10}{50}$

$= \frac {23}{50}$

$=\frac {28}{48}+\frac {9}{48}$

$= \frac {37}{48}$

$=\frac {16}{18}+\frac {3}{18}$

= $\frac{19}{18}$

$=(\frac {3}{4}+\frac {1}{4})+(\frac {7}{9}+\frac {1}{9})$

$=1+\frac {8}{9}$

$= 1\frac {8}{9}$

$=\frac {19}{11}-\frac {8}{11}+\frac {2}{3}$

$=1+\frac {2}{3}$

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

$=\frac {13}{12}-(\frac {5}{6}+\frac {1}{6})$

$=\frac {13}{12}-1$

$= \frac {1}{12}$

$=(\frac {6}{13}+\frac {7}{13})-(\frac {3}{7}+\frac {4}{7})$

$=1-1$

$= 0$

第一个月绣了整幅作品的$\frac {2}{5}，$

第二个月绣了整幅作品的$\frac {1}{2}。$

两个月一共绣的：$\frac {2}{5}+\frac {1}{2}=\frac {4}{10}+\frac {5}{10}=\frac {9}{10}$

还剩下的：$1 - \frac {9}{10}=\frac {1}{10}$

答$：$两个月一共绣了整幅作品的$\frac {9}{10}，$还剩下$\frac {1}{10}$没绣。