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電子課本網(wǎng) › 第14頁(yè)

第14頁(yè)

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?$=-85×(25×4)$?
?$=-85×100$?
?$=-8500$?
?$=-8×\frac {4}{3}×\frac {5}{4}×\frac {5}{4}$?
?$=-\frac {50}{3}$?
=0
?$=\frac {7}{9}×36-\frac {5}{6}×36+\frac {3}{4}×36-\frac {7}{18}×36$?
?$=28-30+27-14$?
?$=11$?
?$=\frac {1}{6}×(-48)+\frac {3}{4}×48-\frac {1}{12}×48$?
?$=-8+36-4$?
?$=24$?
?$=5×7+5×(-6)$?
?$=5×(7-6)$?
?$=5$?
?$=(4-3+6)×(-3 \frac {6}{7})$?
?$=7×(-\frac {27}{7})$?
?$=-27$?
?$=(100-\frac {1}{25})×(-25)$?
?$=100×(-25)+\frac {1}{25}×25$?
?$=-2500+1$?
?$=-2499$?
?$=\frac {22}{17}×\frac {25}{8}×\frac {8}{15}×\frac {34}{9}$?
?$=\frac {220}{27}$?
?$=\frac {3}{2}×\frac {5}{4}×\frac {7}{6}×···×\frac {21}{20}×\frac {2}{3}×\frac {4}{5}×\frac {6}{7}×···×\frac {20}{21}$?
?$=(\frac {3}{2}×\frac {2}{3})×(\frac {5}{4}×\frac {4}{5})×(\frac {7}{6}×\frac {6}{7})×···×(\frac {21}{20}×\frac {20}{21})$?
?$=1×1×1×···×1$?
?$=1$?
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