第43页 - 亮点给力提优课时作业本六年级数学江苏版

1

6

$1\frac{1}{4}$

$3\frac{1}{3}$

$1\frac{3}{4}$

2

$\frac{12}{35}$

$\frac{1}{16}$

$=\frac {2}{5}×45+\frac {5}{9}×45$

$=18+25$

$=43$

$=5-(\frac {6}{7}×\frac{14}{3}+\frac {3}{16})$

$=5-(4+\frac {3}{16})$

$=5-4-\frac {3}{16}$

$=\frac {13}{16}$

$=\frac{1}{4}÷\frac{7}{6}×\frac{4}{5}$

$=\frac{1}{4}×\frac{6}{7}×\frac{4}{5}$

$=\frac{3}{14}×\frac{4}{5}$

$=\frac{6}{35}$

$=\frac {8}{9}×\frac {2}{5}+\frac {3}{5}×\frac {8}{9}$

$=\frac {8}{9}×(\frac {2}{5}+\frac {3}{5})$

$=\frac {8}{9}×1$

$=\frac{8}{9}$

$=\frac {24}{19}×\frac {1}{8}+\frac {16}{17}×\frac {1}{8}×\frac {15}{17}$

$=\frac {3}{19}+(\frac {2}{17}+\frac {15}{17})$

$=\frac {3}{19}+1$

$=1\frac{3}{19}$

$解:1.2x=360$

$x=360÷1.2$

$x=300$

$解:7x=\frac{2}{3}+\frac{2}{3}$

$7x=\frac{4}{3}$

$x=\frac{4}{21}$

$解:2x=\frac{7}{8}$

$x=\frac{7}{16}$

20

6

60

120

1

45

5

90

36

$=\frac {2}{25}÷(\frac {8}{9}×\frac{3}{10})$

$=\frac {2}{25}÷\frac{4}{15}$

$=\frac {2}{25}×\frac{15}{4}$

$=\frac{3}{10}$