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90x[(60x20:10-10)+(80:40x10+20-10)] cum se face ex

Răspuns :

90x[(60x20:10-10)+(80:40x10+20-10)]=90x[(1.200:10-10)+(2 x 10+20-10)]=
90x(110+30)=
90x140=
12.600

90×[(60×20:10-10)+(80:40×10+20-10)]=90×(110+30)=90×140=12600