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第60頁

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???$=789+64×13$???
???$=789+832$???
???$=1621$???
???$=720-735÷21$???
???$=720-35$???
???$=685$???
???$=666÷(901-864)$???
???$=666÷37$???
???$=18$???
??$ =909×[720\div 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 {5}{4}+\frac {11}{18}×\frac {5}{4}$??
??$ =(\frac {7}{18}+\frac {11}{18})×\frac {5}{4}$??
??$ =1×\frac {5}{4}$??
??$ =\frac {5}{4}$??
$ \left(1\right)48+169+52$
$=48+52+169$
$=100+169$
$=269$

$(2)25\times 73\times 0.4$
$=25\times 0.4\times 73$
$=10\times 73$
$=730$

$(3)43\times 102$
$=43\times \left(100+2\right)$
$=43\times 100+43\times 2$
$=4300+86$
$=4386$

$(4)\frac{4}{9}+\frac{3}{17}+\frac{5}{9}+\frac{4}{17}$
$=(\frac{4}{9}+\frac{5}{9})+(\frac{3}{17}+\frac{4}{17})$
$=1+\frac{7}{17}$
$=1\frac{7}{17}$

$(5)\frac{7}{18}\times \frac{5}{4}+\frac{11}{18}\div \frac{4}{5}$
$=\frac{7}{18}\times \frac{5}{4}+\frac{11}{18}\times \frac{5}{4}$
$=(\frac{7}{18}+\frac{11}{18})\times \frac{5}{4}$
$=1\times \frac{5}{4}$
$=\frac{5}{4}$
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