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電子課本網(wǎng) 第70頁

第70頁

信息發(fā)布者:
?$ \frac {27}{28}$?
?$ \frac {93}{140}$?
?$ \frac {11}{24}$?
?$ \frac {23}{24}$?
$\frac{17}{20}$
$\frac{11}{20}$
$\frac{1}{2}$
1
??$ \frac {7}{8}$??
??$ \frac {23}{40}$??
$\frac{17}{40}$
??$ \frac {37}{40}$??
$\frac{7}{9}$
+
$\frac{8}{9}$
加法結(jié)合律
-
$\frac{1}{4}$
+
$\frac{1}{5}$
減法的性質(zhì)
?$ 解:? x=\frac 38+\frac 5{12}?$?
?$? x=\frac {19}{24}?$?
?$ 解:? x=2-\frac 7{15}?$?
?$? x=\frac {23}{15}?$?
?$ 解:? x=\frac {17}{16}-\frac 78?$?
?$? x=\frac 3{16}?$?
?$?=\frac 3{24}+\frac {10}{24}-\frac {12}{24}?$?
?$? =\frac 1{24}?$?
?$?=\frac 89+\frac 19-\frac 38?$?
?$? =\frac 58?$?
?$?=\frac 78-\frac 78+(\frac 57+\frac 57)?$?
?$? =\frac {10}7?$?
?$=1-(\frac 18+\frac 78)$?
?$=0$?
?$?=\frac {13}8+\frac 38-\frac 56?$?
?$?=2-\frac 56?$?
?$?=\frac 76?$?
?$?=\frac 18+\frac 18+(\frac 47-\frac 47)?$?
?$? =\frac 14?$?