Обчисли:
1) –4,513 + 5,21;
2) 7,25 + (–8,311);
3) 5,73 + (–4,217);
4) -$\frac{9}{17}$+ 1;
5) –5 +(-$\frac{2}{13}$);
6) –3 + 2$\frac{7}{9}$.
Розв'язок:
1) –4,513 + 5,21 = 0,697;
2) 7,25 + (–8,311) = –1,061;
3) 5,73 + (–4,217) = 1,513;
4) $-\frac{9}{17} + 1 = -\frac{9}{17} + \frac{17}{17} = \frac{8}{17}$;
5) $-5 + \left(-\frac{2}{13}\right) = -5\frac{2}{13}$;
6) $-3 + 2\frac{7}{9} = -\frac{9-7}{9} = -\frac{2}{9}$.