Завдання:
Спрости вираз та випиши окремо його коефіцієнт:
1) –3 ⋅ a ⋅ 7;
2) –5x ⋅ 0,2y;
3) 4,2a ⋅ (–2) ⋅ b;
4) –3,7a ⋅ (–2y);
5) 3,7 ⋅ 2,5 ⋅ x ⋅ (–1);
6) 3x ⋅ (–9y) ⋅ 2z.
Розв'язок:
1) -3 ⋅ а ⋅ 7 = -3 ⋅ 7 ⋅ а = -21а; коефіцієнт -21
2) -5х ⋅ 0,2у = -5 ⋅ 0,2 ⋅ х ⋅ у = -ху; коефіцієнт -1
3) 4,2 ⋅ a ⋅ (-2) ⋅ b = 4,2 ⋅ (-2) ⋅ a ⋅ b = -8,4xy; коефіцієнт -8,4
4) -3,7а ⋅ (-2у) = -3,7 ⋅ (-2) ⋅ а ⋅ у = 7,4ау; коефіцієнт 7,4
5) 3,7 ⋅ 2,5 ⋅ х ⋅ (-1) = 3,7 ⋅ 2,5 ⋅ (-1) ⋅ х = -9,25х; коефіцієнт -9,25
6) 3x ⋅ (-9y) ⋅ 2z = 3 ⋅ (-9) ⋅ 2 ⋅ xyz = -54xyz; коефіцієнт -54