№ 272 Алгебра = № 11.9 Математика
Спростіть вираз:
1) –2p ⋅ 3,5;
2) 7а ⋅ (–1,2);
3) 0,2x ⋅ (–3у);
4) –1$\frac{1}{3}$m ⋅ (–3n).
Розв'язок:
1) –2p ⋅ 3,5 = –2 ⋅ 3,5 ⋅ р = –7р
2) 7а ⋅ (–1,2) = 7 ⋅ (–1,2) ⋅ а = –8,4а
3) 0,2x ⋅ (–3у) = 0,2 ⋅ (–3) ⋅ х ⋅ у = –0,6ху
4) –1$\frac{1}{3}$m ⋅ (–3n) = –$\frac{4}{3}$ ⋅ (–3) ⋅ m ⋅ n = 4mn