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1. {[(7×3-5)+2×6):4+5}×10-[(9+7)×5-60]=
2.1500{250:5+15:3×[265(50:25+2)×65]×150}=
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Răspuns :

{[(21-5)+2×6):4+5}×10-[16×5-60]=[(16+12):4+5]×10-[80-60]=(28:4+5)×10-20=(7+5)×10-20=12×10-20=120-20=100