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a fost răspuns

Se considera numarul a=(1,2 la a 3 :0,9-1,2):0,06.aratati ca a€ N.

Răspuns :

a=(1,728:0,9-1,2):0,06
a=(1,92-1,2):0,06
a=0,72:0,06
a=12

sau

a=(1728/1000:9/10-12/10):6/100
a=(1728/1000x10/9-12/10)x100/6
a=(1728/900-12/10)x100/6
a=(1728/900-1080/900)x100/6
a=648/900x100/6
a=648/54
a=12

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