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第60頁(yè)

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???=789+64×13???
???=789+832???
???=1621???
???=720-735÷21???
???=720-35???
???=685???
???=666÷(901-864)???
???=666÷37???
???=18???
=909×[720÷80]
=909×9
=8181
?$ =\frac {2}{3}×\frac {1}{12}$?
?$ =\frac {1}{18}$?
?$ =\frac {3}{5}\div [\frac {3}{8}×\frac {2}{3}]$?
?$ =\frac {3}{5}\div \frac {1}{4}$?
?$ =\frac {12}{5}$?
=48+52+169
=100+169
=269
=25×0.4×73
=10×73
=730
=43×(100+2)
=43×100+43×2
=4300+86
=4386
?$ =(\frac {4}{9}+\frac {5}{9})+(\frac {3}{17}+\frac {4}{17})$?
?$ =1+\frac {7}{17}$?
?$ =1\frac {7}{17}$?
?$=(\frac {7}{18}+\frac {11}{18})×\frac {5}{4}$?
?$ =1×\frac {5}{4}$?
?$ =\frac {5}{4}$?
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