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Calculeaza respecrand ordinea operatiilor:a)9-2×3=;16+4×6=;90-7×8=;1000-5×7=;80+15×7=;76+23×25=;185+128×17=;5900-36×42=;8-3×2+1=;60-8×2-18=;501-202×2+25=;72:8+64×2-19=;942×6-252×5=;76+30×50+80=;1400×81:9-1214=;2000-100:10+6×7=;70+20×50-68=;783+24×72-1400=;10000-64:8-3927=;973+855-43×14=.