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電子課本網(wǎng) › 第74頁

第74頁

信息發(fā)布者：

$\frac {8}{15}$

$\frac {7}{15}$

$1\frac {1}{6}$

$\frac {1}{42}$

$\frac {3}{10}$

$\frac {1}{12}$

$4\frac {7}{8}$

$?=\frac {28}{36}-\frac {21}{36}?$

$? =\frac 7{36}?$

$?=\frac {24}{45}+\frac 5{45}?$

$? =\frac {29}{45}?$

$?=\frac {10}{42}-\frac 7{42}?$

$? =\frac 1{14}?$

$?=\frac {13}{20}+\frac 8{20}?$

$? =\frac {21}{20}?$

$ 解：? x=\frac {13}{20}+\frac 54?$

$? x=\frac {19}{10}?$

$ 解：? x=\frac {14}{15}-\frac 7{30}?$

$? x=\frac 7{10}?$

$ 解：? x=\frac {23}{24}-\frac 7{12}?$

$? x=\frac 38?$

$?=\frac 57-(\frac 5{16}+\frac 3{16})?$

$? =\frac 57-\frac 12?$

$? =\frac 3{14}?$

$?=\frac {11}{12}+\frac 1{12}+(\frac 58+\frac 38)?$

$? =1+1?$

$? =2?$

$?=\frac {11}{15}-\frac 8{15}-\frac 16?$

$? =\frac 15-\frac 16?$

$? =\frac 1{30}?$

分?jǐn)?shù)的基本性質(zhì)

$? \frac 49?$

$? \frac {23}{27}?$

減法的性質(zhì)

$? \frac 7{15}?$