1215 и 1221 пожалуйста помогите

12151)
$0.18= \frac{1}{10}+ \frac{8}{100} = 0.1+0.08$
$0.315= \frac{3}{10}+ \frac{1}{100} + \frac{5}{1000} = 0.3+0.01+0.005$
$0.14= \frac{1}{10}+ \frac{4}{100} = 0.1+0.04$
$0.222= \frac{2}{10}+ \frac{2}{100} + \frac{2}{1000} = 0.2+0.02+0.002$
$0.8627= \frac{8}{10}+ \frac{6}{100} + \frac{2}{1000}+ \frac{7}{1000} = 0.8+0.06+0.002+0.0007$
2)
$2.9=2+ \frac{9}{10} =2+0.9$
$4.61=4+ \frac{6}{10} +\frac{1}{100} =4+0.6+0.01$
$8.731=8+ \frac{7}{10} +\frac{3}{100}+\frac{1}{1000} =8+0.7+0.03+0.001$
$6.44=6+ \frac{4}{10} +\frac{4}{100} =6+0.4+0.04$
$7.9312=7+ \frac{9}{10} +\frac{3}{100}+\frac{1}{1000}+ \frac{2}{10000} =7+0.9+0.03+0.001+0.0002$

1221.1)
$0.07=\frac{7}{100}=0.07$
$0.421=\frac{4}{10} +\frac{2}{100}+\frac{1}{1000}=0.4+0.02+0.001$
$0.083=\frac{8}{100} +\frac{3}{1000}=0.08+0.003$
$0.609=\frac{6}{10} +\frac{9}{1000}=0.6+0.009$
$0.0907=\frac{9}{100} +\frac{7}{10000}=0.09+0.0007$
2)
$3.11=3+\frac{1}{10} +\frac{1}{100}=3+0.1+0.01$
$2.021=2+\frac{2}{100} +\frac{1}{1000}=2+0.02+0.001$
$5.307=5+\frac{3}{10} +\frac{7}{1000}=5+0.3+0.007$
$31.4029=31+\frac{4}{10} +\frac{2}{1000}+\frac{9}{10000}=31+0.4+0.002+0.0009$
$12.0303=12+\frac{3}{100} +\frac{3}{10000}=12+0.03+0.0003$