Номер 1283

1) –3 = (–1) · 3;
–1,7 = (–1) · 1,7;
8 = (–1) · (–8);
–0,64 = (–1) · 0,64;
0,3 = (–1) · (–0,3);

2) –3 = 1 · (–3);
–1,7 = 1 · (–1,7);
8 = 1 · 8;
–0,64 = 1 · (–0,64);
0,3 = 1 · 0,3.