Răspuns :
142X7=994
930:3 =310
9990-994+310=9306
900:3=300
54X3=162
884:2=442
442+(300-162)=
442+138=580
930:3 =310
9990-994+310=9306
900:3=300
54X3=162
884:2=442
442+(300-162)=
442+138=580