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calculează folosind nr comun a)73×538-73×500-73×37 b)3+6+9+.........+90 c)300×299+299×298-598×198

Răspuns :

a) 73(538-500-37)=73
b) 3(1+2+3.....+30) si calculezi daca ai invatat formula pt suma (gauss)

73×(538-500-37)=73
3×(1+2+3+...+30)=15×31×3=1395
299(300+298)-598×198=
299×598-598×198=
598×(299-198)=
598×101=60398