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1.每日速算。
$1.7+12.8=$
$\frac {1}{5}+\frac {1}{6}=$
$1.7+12.8=$
14.5
$20-1.4=$18.6
$34×0.5=$17
$36.6÷6=$6.1
$\frac {1}{5}+\frac {1}{6}=$
$\frac{11}{30}$
$1-\frac {3}{10}=$$\frac{7}{10}$
$\frac {1}{4}+\frac {4}{7}+\frac {3}{7}=$$1\frac{1}{4}$
$1-\frac {2}{5}-\frac {1}{5}=$$\frac{2}{5}$
答案：
1. 14.5
18.6
17
6.1
$\frac{11}{30}$
$\frac{7}{10}$
$1\frac{1}{4}$
$\frac{2}{5}$
18.6
17
6.1
$\frac{11}{30}$
$\frac{7}{10}$
$1\frac{1}{4}$
$\frac{2}{5}$
2.计算下面各题,能简便计算的要用简便方法计算。
$\frac {13}{18}+\frac {2}{13}+\frac {11}{13}$ $1-\frac {17}{18}-\frac {1}{18}$ $\frac {6}{11}+\frac {11}{15}+\frac {5}{11}-\frac {6}{15}$
$\frac {1}{4}+\frac {2}{11}+\frac {3}{4}$ $2+(\frac {7}{10}-\frac {3}{8})$ $\frac {13}{20}+\frac {20}{9}+\frac {7}{9}+\frac {7}{20}$
$\frac {13}{18}+\frac {2}{13}+\frac {11}{13}$ $1-\frac {17}{18}-\frac {1}{18}$ $\frac {6}{11}+\frac {11}{15}+\frac {5}{11}-\frac {6}{15}$
$\frac {1}{4}+\frac {2}{11}+\frac {3}{4}$ $2+(\frac {7}{10}-\frac {3}{8})$ $\frac {13}{20}+\frac {20}{9}+\frac {7}{9}+\frac {7}{20}$
答案：
$\frac{13}{18}+\frac{2}{13}+\frac{11}{13}$
$=\frac{13}{18}+(\frac{2}{13}+\frac{11}{13})$
$=\frac{13}{18}+1$
$=1\frac{13}{18}$
$1-\frac{17}{18}-\frac{1}{18}$
$=1-(\frac{17}{18}+\frac{1}{18})$
$=1-1$
$=0$
$\frac{6}{11}+\frac{11}{15}+\frac{5}{11}-\frac{6}{15}$
$=(\frac{6}{11}+\frac{5}{11})+(\frac{11}{15}-\frac{6}{15})$
$=1+\frac{5}{15}$
$=1+\frac{1}{3}$
$=1\frac{1}{3}$
$\frac{1}{4}+\frac{2}{11}+\frac{3}{4}$
$=(\frac{1}{4}+\frac{3}{4})+\frac{2}{11}$
$=1+\frac{2}{11}$
$=1\frac{2}{11}$
$2+(\frac{7}{10}-\frac{3}{8})$
$=2+(\frac{28}{40}-\frac{15}{40})$
$=2+\frac{13}{40}$
$=2\frac{13}{40}$
$\frac{13}{20}+\frac{20}{9}+\frac{7}{9}+\frac{7}{20}$
$=(\frac{13}{20}+\frac{7}{20})+(\frac{20}{9}+\frac{7}{9})$
$=1+3$
$=4$
$=\frac{13}{18}+(\frac{2}{13}+\frac{11}{13})$
$=\frac{13}{18}+1$
$=1\frac{13}{18}$
$1-\frac{17}{18}-\frac{1}{18}$
$=1-(\frac{17}{18}+\frac{1}{18})$
$=1-1$
$=0$
$\frac{6}{11}+\frac{11}{15}+\frac{5}{11}-\frac{6}{15}$
$=(\frac{6}{11}+\frac{5}{11})+(\frac{11}{15}-\frac{6}{15})$
$=1+\frac{5}{15}$
$=1+\frac{1}{3}$
$=1\frac{1}{3}$
$\frac{1}{4}+\frac{2}{11}+\frac{3}{4}$
$=(\frac{1}{4}+\frac{3}{4})+\frac{2}{11}$
$=1+\frac{2}{11}$
$=1\frac{2}{11}$
$2+(\frac{7}{10}-\frac{3}{8})$
$=2+(\frac{28}{40}-\frac{15}{40})$
$=2+\frac{13}{40}$
$=2\frac{13}{40}$
$\frac{13}{20}+\frac{20}{9}+\frac{7}{9}+\frac{7}{20}$
$=(\frac{13}{20}+\frac{7}{20})+(\frac{20}{9}+\frac{7}{9})$
$=1+3$
$=4$
3.数一数。
(1)下面每个大正方体各由几个小正方体组成?
(
(
(
(2)下面的图形各有几个小正方体?
(
(
(
(
(1)下面每个大正方体各由几个小正方体组成?
(
8
)个(
27
)个(
64
)个(2)下面的图形各有几个小正方体?
(
7
)个(
6
)个(
11
)个(
5
)个
答案：
3.
(1) 8 27 64
(2) 7 6 11 5
(1) 8 27 64
(2) 7 6 11 5
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