Найди значение дробного выражения.
а) 27х0,9
_____
0,9+2,7

б)9х4,2
_____
18-4,2

в)0,64+0,16
_______
6,4х1,6

г)0,75+а ,если а = 1,6;1; 8
_____ _
5ха 5
_
8
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