第69页

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72
$90\frac{1}{6}$
900÷[(102−87)×3]=20
$\frac{25}{18}$
240
180
D
B
A
25.5
$\frac{4}{5}$
11
=0.25×4×0.8×0.125
=0.1
=(8.76+1.24)-(5.29+2.71)
=2
$=7×\frac {1}{7}×8-7×\frac {1}{8}×8$
$=1$
$=\frac {7}{13}×(\frac {3}{4}+\frac {1}{4})$
$=\frac {7}{13}$
=20.1×(20-19)
=20.1
$=1+1-\frac {1}{2}+\frac {1}{2}-\frac {1}{4}+\frac {1}{4}-\frac {1}{8}+\frac {1}{8}-\frac {1}{16}$
$=2-\frac {1}{16}$
$=1\frac {15}{16}$
58
61
B
A
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