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80:20+3x[50+3x(350:7-98:2)]=

Răspuns :

4+3×[50+3×(50-49)]=4+3×(50+3)=4+3×53=4+159=163
Baftă!
80:20+3×[50+3×(350:7-98:2)]=
80:20+3×[50+3×1]=
80:20+3×53=
4+3×53= 163