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@Muyndz06

#Hoidao247

a) `15,9` x `100` - `15,9` x `8,2` - `15.9` x `81,8`

`=` `15,9` x ( `100` - `8,2` - `81,8` )

`=` `15,9` x `10`

`=` `159`

b) $\frac{9}{12}$ : `6` + $\frac{5}{12}$ : `6`

`=` ($\frac{9}{12}$ + $\frac{5}{12}$) : `6`

`=` $\frac{7}{6}$ : `6`

`=` $\frac{7}{36}$ 

c) `203,45 x 90 + 203,45 x 10`

= `203,45` x ( `90` + `10` )

= `203,45` x `100`

= `20` `345`