(1)同分母分数相加、减,(
分母
)不变,只把(分子
)相加、减。计算的结果,能约分的要约成(最简分数
)。
答案:
分母 分子 最简分数
“$\frac {7}{15}-\frac {4}{15}$”表示7个$\frac {1}{15}$减去(
4
)个$\frac {1}{15}$,结果是(3
)个$\frac {1}{15}$,就是($\frac{3}{15}$
),化简后得($\frac{1}{5}$
)。
答案:
4 3 $\frac{3}{15}$ $\frac{1}{5}$
(3)从1里面连续减去(
6
)个$\frac {1}{7}$,结果等于$\frac {1}{7}$。
答案:
6
(4)在$◯$里填上“>”“<”或“=”。
$\frac {5}{8}+\frac {1}{8}◯$
$\frac {5}{8}+\frac {1}{8}◯$
>
$\frac {7}{10}-\frac {1}{10}$ $\frac {17}{30}+\frac {13}{30}◯$=
$\frac {15}{16}+\frac {1}{16}$ $\frac {2}{19}+\frac {5}{19}◯$<
$\frac {11}{12}-\frac {4}{12}$
答案:
> = <
(1)直接写出得数。
$\frac {9}{8}+\frac {1}{8}=$
$\frac {13}{16}-\frac {5}{16}=$
$\frac {9}{8}+\frac {1}{8}=$
$\frac{5}{4}$
$\frac {18}{25}-\frac {3}{25}=$$\frac{3}{5}$
$1-\frac {11}{24}=$$\frac{13}{24}$
$\frac {3}{11}+\frac {7}{11}=$$\frac{10}{11}$
$\frac {13}{16}-\frac {5}{16}=$
$\frac{1}{2}$
$\frac {9}{5}+\frac {1}{5}=$2
$\frac {7}{8}-\frac {3}{8}=$$\frac{1}{2}$
$\frac {5}{18}+\frac {7}{18}=$$\frac{2}{3}$
答案:
$\frac{5}{4}$ $\frac{3}{5}$ $\frac{13}{24}$ $\frac{10}{11}$ $\frac{1}{2}$ 2 $\frac{1}{2}$ $\frac{2}{3}$
(2)计算。
$\frac {2}{17}+\frac {3}{17}+\frac {8}{17}=$
$1-\frac {2}{15}-\frac {4}{15}=$
$\frac {4}{9}-\frac {2}{9}+\frac {7}{9}=$
$\frac {4}{15}+\frac {8}{15}-\frac {7}{15}=$
$\frac {11}{13}-\frac {5}{13}+\frac {7}{13}=$
$1-\frac {7}{20}-\frac {1}{20}=$
$\frac {2}{17}+\frac {3}{17}+\frac {8}{17}=$
$\frac{13}{17}$
$1-\frac {2}{15}-\frac {4}{15}=$
$\frac{3}{5}$
$\frac {4}{9}-\frac {2}{9}+\frac {7}{9}=$
1
$\frac {4}{15}+\frac {8}{15}-\frac {7}{15}=$
$\frac{1}{3}$
$\frac {11}{13}-\frac {5}{13}+\frac {7}{13}=$
1
$1-\frac {7}{20}-\frac {1}{20}=$
$\frac{3}{5}$
答案:
$\frac{13}{17}$ $\frac{3}{5}$ 1 $\frac{1}{3}$ 1 $\frac{3}{5}$
$\frac {4}{15}+\frac {2}{15}=
\frac{13}{15}
-\frac {7}{15}$ $\frac {17}{21}-\frac{3}{7}
= \frac {7}{21}+\frac {1}{21}$ $\frac {23}{30}-\frac{5}{30}
= \frac {7}{30}+\frac{11}{30}
$
答案:
$\frac{13}{15}$ $\frac{3}{7}$ $\frac{5}{30}$ $\frac{11}{30}$ (后两空答案不唯一)
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