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[2.(3) x 0.3 + 7.(1) x 4,5] :1.2

Răspuns :

[21/9*3/10+64/9*45/10]:12/10=
[21/30+320/10]:12/10=
[7/10+320/10]:12/10=
327/10*10/12=327/12=109/4