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[tex]1 = \frac{9}{10} .2 = \frac{12}{100} = \frac{3}{25} .3 = \frac{32}{100} = \frac{8}{25} [/tex]

1)0,9=9/10
2)0,12=12/100=(12:4)/(100:4)=3/25
3)0,32=32/100=(32:4)/(100:4)=8/25
4)0,145=145/1000=(145:5)/(1000:5)=29/200
5)0,016=16/1000=(16:4)/(1000:4)=4/250
6)6,12=612/100=(612:4)/(100:4)=153/25=6 3/25
7)3,132=3132/1000=(3132:4)/(1000:4)=783/250=3 33*250
8)4,125=4125/1000=(4125:125)/(1000:125)=33/8=4 1/8
9)8,214=8214/1000=(8214:2)/(1000:2)=4107/500=8 107/500
10)7,64=764/100=(764:4)/(100:4)=191/25=7 16/25