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第59頁

信息發(fā)布者：
?$=\frac {21}{28}+\frac {4}{28}$?
?$=\frac {25}{28}$?
?$=\frac {5}{6}-\frac {4}{6}$?
?$=\frac {1}{6}$?
?$=\frac {9}{15}-\frac {8}{15}$?
?$=\frac {1}{15}$?
?$=\frac {36}{42}+\frac {9}{42}+\frac {8}{42}$?
?$=\frac {15}{14}+\frac {8}{42}$?
?$=\frac {53}{42}$?
?$=\frac {8}{9}-\frac {2}{9}-\frac {1}{3}$?
?$=\frac {2}{3}-\frac {1}{3}$?
?$=\frac {1}{3}$?
?$=\frac {35}{40}+\frac {12}{40}-\frac {30}{40}$?
?$=\frac {47}{40}-\frac {30}{40}$?
?$=\frac {17}{40}$?
?$=(\frac {2}{9}+\frac {7}{9})+(\frac {2}{15}+\frac {3}{15})$?
?$=1+\frac {1}{3}$?
?$=1 \frac {1}{3}$?
第一個(gè)正方形中涂色部分占整體的?$ \frac {1}{4}，$?
第二個(gè)正方形中涂色部分占整體的?$ \frac {8}{16}= \frac {1}{2}，$?
第三個(gè)正方形中涂色部分占整體的?$ \frac {5}{9}，$?
?$ \frac {1}{4}= \frac {9}{36}，$?
?$ \frac {1}{2}= \frac {18}{36}，$?
?$ \frac {5}{9}= \frac {20}{36}，$?
因?yàn)?$ \frac {9}{36}＜ \frac {18}{36}＜ \frac {20}{36}，$?
所以?$ \frac {1}{4}＜ \frac {1}{2}＜ \frac {5}{9}，$?
所以第三個(gè)正方形的涂色部分最大.

?$1$?千克?$=1000$?克，
?$400÷1000=\frac {400}{1000}=\frac {2}{5}$?
?$280÷1000=\frac {280}{1000}=\frac {7}{25}$?
?$200÷1000=\frac {200}{1000}=\frac {1}{5}$?
答：蛋白質(zhì)、淀粉、脂肪各占總重量的?$\frac {2}{5}、$??$\frac {7}{25}、$??$\frac {1}{5}.$
?
$\frac {7}{8}+\frac {7}{8}-\frac {1}{4}$
$=\frac {7}{4}-\frac {1}{4}$
$=\frac {3}{2}$
答：做上衣和褲子一共用去?$\frac {3}{2}$?米。
?$1-\frac {1}{5}-\frac {3}{10}=\frac {1}{2}$?
答：白菜的種植面積占這塊菜地的?$\frac {1}{2}.$?
?$\frac {7}{20}$?
?$\frac {1}{10}$?
?$\frac {9}{20}$?
?$\frac {2}{5}$?
?$\frac {3}{20}$?
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