一、口算。
$7.6÷0.1=$
$0.9^{2}=$
$\frac{3}{8}+\frac{3}{16}=$
$\frac{1}{2}-40\%=$
$\frac{15}{44}×\frac{4}{5}=$
$4.6÷2.3=$
$4÷20\%=$
$6.6+0.4=$
$4.18×30=$
$\frac{5}{6}+40\%=$
$368-199=$
$\frac{7}{12}÷\frac{14}{3}=$
$76÷38\%=$
$\frac{3}{2}-\frac{2}{3}=$
$7.2÷0.9=$
$9-0.32=$
$\frac{3}{4}÷\frac{2}{7}=$
$20×65\%=$
$\frac{5}{2}÷45=$
$\frac{7}{5}+\frac{1}{4}=$
$36\%+1.24=$

一、76 0.81 $\dfrac{9}{16}$ 0.1 $\dfrac{3}{11}$ 2 20 7 125.4 $\dfrac{37}{30}$ 169 $\dfrac{1}{8}$ 200 $\dfrac{5}{6}$ 8 8.68 $\dfrac{21}{8}$ 13 $\dfrac{1}{18}$ 1.65 1.6

二、解比例。
$x:1.2=\frac{5}{4}$
$50:x=1.4:84$
$17:5=x:15$
$\frac{2}{3}:x=\frac{1}{4}:\frac{6}{5}$
$x:0.6=1.2:2.4$
$8:x=\frac{1}{3}:\frac{1}{4}$

二、$x=\dfrac{3}{2}$ $x=3000$ $x=51$ $x=\dfrac{16}{5}$ $x=0.3$ $x=6$

$x:1.2=\frac{5}{4}$
$4x=1.2×5$
$4x=6$
$x=\frac{6}{4}=\frac{3}{2}$
$50:x=1.4:84$
$1.4x=50×84$
$1.4x=4200$
$x=4200÷1.4=3000$
$17:5=x:15$
$5x=17×15$
$5x=255$
$x=255÷5=51$
$\frac{2}{3}:x=\frac{1}{4}:\frac{6}{5}$
$\frac{1}{4}x=\frac{2}{3}×\frac{6}{5}$
$\frac{1}{4}x=\frac{12}{15}=\frac{4}{5}$
$x=\frac{4}{5}×4=\frac{16}{5}$
$x:0.6=1.2:2.4$
$2.4x=0.6×1.2$
$2.4x=0.72$
$x=0.72÷2.4=0.3$
$8:x=\frac{1}{3}:\frac{1}{4}$
$\frac{1}{3}x=8×\frac{1}{4}$
$\frac{1}{3}x=2$
$x=2×3=6$