Номер 28.
Найдите значение выражения:
а) 4 ⋅ 4 + 8 ⋅ 3;
б) 6 ⋅ 9 + 5 ⋅ 4;
в) 9 ⋅ 3 + 8 ⋅ 2;
г) 4 ⋅ 8 + 7 ⋅ 7;
д) 3 ⋅ 7 + 4 ⋅ 9;
е) 6 ⋅ 7 + 7 ⋅ 4.
Ответ:а) 4 ⋅ 4 + 8 ⋅ 3=16+24=40
б) 6 ⋅ 9 + 5 ⋅ 4=54+20=74
в) 9 ⋅ 3 + 8 ⋅ 2=27+16=43
г) 4 ⋅ 8 + 7 ⋅ 7=32+49=81
д) 3 ⋅ 7 + 4 ⋅ 9=21+36=57
е) 6 ⋅ 7 + 7 ⋅ 4=42+28=70
