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Calculeaza:3-18/7;1_1/4;1+1/3;2/5+1;2-7/9?

Răspuns :

3-18/7=(7x3-18)/7=3/7
1+1/3=(3+1)/3=4/3
2/5+1=(2+5)/5=7/5
2-7/9=(9x2-7)/9=11/9
1-1/4=(4-1)/4=3/4