【答案】:
$? =18×\frac 23+\frac 9{13}×\frac 23?$
$? =12+\frac 6{13}?$
$? =12\frac 6{13}?$
$? =\frac 45×9+\frac 15×9?$
$? =(\frac 45+\frac 15)×9?$
? =9?
$? =(1-\frac 16)×\frac {12}5?$
$? =\frac 56×\frac {12}5?$
? =2?
$? =(101-1)×\frac {11}{20}?$
$? =100×\frac {11}{20}?$
? =55?
$? =\frac 37×7-\frac 1{34}×7-\frac {27}{34}?$
$? =3-(\frac 7{34}+\frac {27}{34})?$
? =3-1?
? =2?
$? =46-11×\frac 17-\frac 17×3?$
$? =46-(11+3)×\frac 17?$
$? =46-14×\frac 17?$
? =46-2?
? =44?
【解析】:
$(18+\frac{9}{13})×\frac{2}{3}$
$=18×\frac{2}{3}+\frac{9}{13}×\frac{2}{3}$
$=12+\frac{6}{13}$
$=12\frac{6}{13}$
$\frac{4}{5}÷\frac{1}{9}+\frac{1}{5}×9$
$=\frac{4}{5}×9+\frac{1}{5}×9$
$=(\frac{4}{5}+\frac{1}{5})×9$
$=1×9$
$=9$
$(1-\frac{3}{16}×\frac{8}{9})÷\frac{5}{12}$
$=(1-\frac{1}{6})×\frac{12}{5}$
$=\frac{5}{6}×\frac{12}{5}$
$=2$
$\frac{11}{20}×101-\frac{11}{20}$
$=\frac{11}{20}×(101-1)$
$=\frac{11}{20}×100$
$=55$
$(\frac{3}{7}-\frac{1}{34})×7-\frac{27}{34}$
$=\frac{3}{7}×7-\frac{1}{34}×7-\frac{27}{34}$
$=3-(\frac{7}{34}+\frac{27}{34})$
$=3-1$
$=2$
$46-11÷7-\frac{1}{7}×3$
$=46-\frac{11}{7}-\frac{3}{7}$
$=46-(\frac{11}{7}+\frac{3}{7})$
$=46-2$
$=44$