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電子課本網 › 第59頁

第59頁

信息發(fā)布者：
0.63
0.936
0.07
0.005
43
3
3
1
50
4
200
8
?$=\frac {2}{5}×(7.25+2.75)$?
?$=\frac {2}{5}×10$?
?$=4$?
?$=3+\frac {1}{11}-\frac {1}{11}$?
?$=3$?
=8+2-3
=7
?$=\frac {15}{19}×(\frac {23}{30}+\frac {7}{30})$?
?$=\frac {15}{19}×1$?
?$=\frac {15}{19}$?
?$=\frac {4}{5}×(\frac {3}{8}-\frac {1}{8})$?
?$=\frac {4}{5}×\frac {1}{4}$?
?$=\frac {1}{5}$?
?$=(\frac {1}{5}+\frac {1}{2})×\frac {5}{8}$?
?$=\frac {1}{8}+\frac {5}{16}$?
?$=\frac {7}{16}$?
128
78.125
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