👤

Calculati:578+(5x6+7x8+5x9-4x7)x3

Răspuns :

578+(5x6+7x8+5x9-4x7)x3= 578+ (30+56+45-28)x3= 578+(131-28)x3= 578+103x3= 578+ 309= 887
578=(5x5+7x8+5x9-4x7)x3=
=578+(25+56+45-28)x3
=578+(81+45-28)x3
=578+(126-28)x3
=578+98x3
=578+294
= 872