一、口算。
$36\div\frac{3}{4}=$ $\frac{4}{5}+\frac{2}{7}=$ $\frac{3}{7}-\frac{1}{21}=$
$\frac{3}{2}-\frac{3}{8}=$ $\frac{3}{40}\times\frac{5}{8}=$ $1.26 + 8.74 =$
$1.95\div0.4=$ $\frac{5}{8}-\frac{1}{10}=$ $\frac{10}{27}\div\frac{4}{9}=$
$2.5\times4.4=$ $1.05 + 3.5 =$ $3.8 - 2.8 =$
$3.15 + 0.76 =$ $\frac{3}{16}\div37.5\%=$ $\frac{7}{22}+\frac{3}{11}=$
$0.05\times0.3=$ $2-\frac{2}{9}=$ $\frac{4}{7}\div\frac{1}{9}=$
$\frac{1}{14}+\frac{4}{5}=$ $\frac{18}{5}\times\frac{2}{3}=$ $\frac{7}{9}\times\frac{45}{49}=$
$125\times0.8=$ $\frac{1}{4}\div\frac{4}{7}=$ $460 - 99 =$
$3.8\div0.19=$ $\frac{3}{14}\times\frac{7}{8}=$ $\frac{3}{7}+3=$
$\frac{4}{5}-\frac{1}{4}=$ $\frac{1}{4}+\frac{5}{12}=$ $\frac{2}{9}\div\frac{8}{5}=$

48 $\frac{38}{35}$ $\frac{8}{21}$ $\frac{9}{8}$ $\frac{3}{64}$ 10 4.875 $\frac{21}{40}$ $\frac{5}{6}$ 11 4.55 1 3.91 $\frac{1}{2}$ $\frac{13}{22}$ 0.015 $1\frac{7}{9}$ $\frac{36}{7}$ $\frac{61}{70}$ $\frac{12}{5}$ $\frac{5}{7}$ 100 $\frac{7}{16}$ 361 20 $\frac{3}{16}$ $3\frac{3}{7}$ $\frac{11}{20}$ $\frac{2}{3}$ $\frac{5}{36}$

二、计算下面各题，怎样简便就怎样计算。
$35 + 50\div25 - 2$ $\frac{3}{4}\times87 + 12\times75\% + 0.75$ $5.65 - 4.29 + 5.35 - 1.71$

35 75 5