Răspuns:
a) 27-6×4=27-24=3
b) 90-45:5-13+17=90-9-13+17=81-13+17=68+17=85
c) 20+(5×6-42:6)=20+(30-7)=20+23=43
d) 12:[4+(27-57:3):4]=12:[4+(27-19):4]=12:(4+8:4)=12:(12:4)=12:3=4
e) 2×[320:4-(5+240:8):7]=2×[80-(5+30):7]=2×(80-35:7)=80-5=75
Explicație:
Sper ca te-am ajutat!!!