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電子課本網(wǎng) › 第21頁

第21頁

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?$=25×\frac {3}{4}+25×\frac {1}{2}-25×\frac {1}{4}$?
?$=25×(\frac {3}{4}+\frac {1}{2}-\frac {1}{4})$?
?$=25×1$?
?$=25$?
?$=7×(2.6+1.5)-4.1×8$?
?$=7×4.1-4.1×8$?
?$=(7-8)×4.1$?
?$=-4.1$?
?$=6×\frac {15}{17}-14×\frac {15}{17}+9×\frac {15}{17}$?
?$=(6-14+9)×\frac {15}{17}$?
?$=\frac {15}{17}$?
?$=(\frac {25}{8}×\frac {8}{25})^{11}×\frac {25}{8}×(-8)$?
?$=1×\frac {25}{8}×(-8)$?
?$=-25$?
?$=(48+\frac {24}{25})×(-\frac {1}{48})$?
?$=48×(-\frac {1}{48})+\frac {24}{25}×(-\frac {1}{48})$?
?$=-1-\frac {1}{50}$?
?$=-\frac {51}{50}$?
?$=-\frac {5}{8}×16-\frac {1}{4}×(-5)×(-64)$?
?$=-10-\frac {1}{4}×5×64$?
?$=-10-80$?
?$=-90$?
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