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一、看图列式计算。
1. (
2. (
1. (
$\frac{1}{4}$
) ($\frac{2}{4}$
) ($\frac{3}{4}$
)2. (
$\frac{1}{6}$
) ($\frac{4}{6}$
) ($\frac{5}{6}$
)答案
1. $\frac{1}{4}$ $\frac{2}{4}$ $\frac{3}{4}$ 2. $\frac{1}{6}$ $\frac{4}{6}$ $\frac{5}{6}$
1. 4个$\frac {1}{7}$是$\frac{(
4
)}{(7
)}$,7个$\frac {1}{7}$是(1
)。答案
$\frac{4}{7}$ 1
2. $\frac {3}{11}+\frac {7}{11}$表示(
3
)个$\frac{(1
)}{(11
)}$加上(7
)个$\frac{(1
)}{(11
)}$,等于(10
)个$\frac{(1
)}{(11
)}$,就是$\frac{(10
)}{(11
)}$。答案
3 $\frac{1}{11}$ 7 $\frac{1}{11}$ 10 $\frac{1}{11}$ $\frac{10}{11}$
3. $\frac {7}{9}-\frac {2}{9}$表示(
7
)个$\frac{(1
)}{(9
)}$减去(2
)个$\frac{(1
)}{(9
)}$,等于(5
)个$\frac{(1
)}{(9
)}$,就是$\frac{(5
)}{(9
)}$。答案
7 $\frac{1}{9}$ 2 $\frac{1}{9}$ 5 $\frac{1}{9}$ $\frac{5}{9}$
4. (湖南省长沙市期末)分数单位是$\frac {1}{8}$的所有最简真分数的和是(
2
)。答案
2
5. (广东省潮州市潮安区金华学校期末)$\frac {a}{12}+\frac {b}{12}$的结果可以用式子表示为(
\frac{a + b}{12}
)。答案
$\frac{a + b}{12}$
6. 修一条公路,第一天修了全长的$\frac {3}{8}$,第二天修了全长的$\frac {1}{4}$,还剩下全长的$\frac{(
3
)}{(8
)}$未修。答案
$\frac{3}{8}$
三、脱式计算。
$\frac {2}{11}+\frac {3}{11}+\frac {4}{11}$
$1-\frac {1}{15}-\frac {4}{15}$
$\frac {1}{7}+\frac {2}{7}+\frac {4}{7}$
$\frac {31}{39}-\frac {17}{39}-\frac {11}{39}$
$1-\frac {1}{8}-\frac {3}{8}$
$\frac {1}{6}+\frac {5}{6}+\frac {1}{6}$
$\frac {2}{11}+\frac {3}{11}+\frac {4}{11}$
$1-\frac {1}{15}-\frac {4}{15}$
$\frac {1}{7}+\frac {2}{7}+\frac {4}{7}$
$\frac {31}{39}-\frac {17}{39}-\frac {11}{39}$
$1-\frac {1}{8}-\frac {3}{8}$
$\frac {1}{6}+\frac {5}{6}+\frac {1}{6}$
答案
$\frac{9}{11}$ $\frac{2}{3}$ 1 $\frac{1}{13}$ $\frac{1}{2}$ $\frac{7}{6}$
四、解方程。
$\frac {8}{15}+x= \frac {13}{15}$
$x+\frac {5}{18}= 1$
$x-\frac {5}{17}= \frac {8}{17}$
$x-\frac {2}{15}-\frac {7}{15}= \frac {2}{15}$
$\frac {8}{15}+x= \frac {13}{15}$
$x = \frac{1}{3}$
$x+\frac {5}{18}= 1$
$x = \frac{13}{18}$
$x-\frac {5}{17}= \frac {8}{17}$
$x = \frac{13}{17}$
$x-\frac {2}{15}-\frac {7}{15}= \frac {2}{15}$
$x = \frac{11}{15}$
答案
$x = \frac{1}{3}$ $x = \frac{13}{18}$ $x = \frac{13}{17}$ $x = \frac{11}{15}$
