Ответ: а) -9; б) 6,8; в) -41/24; г) 0; д) -3,9; е) -2,5; ж) -7,98; з) 295/208; и) -0,7
a) −2.9 + (−6.1) = −2.9 − 6.1 = −9
б) −5.4 + 12.2 = 6.8
в) −1 \(\frac{1}{6}\) + (−2 \(\frac{3}{8}\)) = −\(\frac{7}{6}\) − \(\frac{19}{8}\) = −\(\frac{28}{24}\) − \(\frac{57}{24}\) = −\(\frac{85}{24}\) = -3 \(\frac{13}{24}\)
г) −6.7 + 6.7 = 0
д) −8.5 − (−4.6) = −8.5 + 4.6 = −3.9
e) 3.8 − 6.3 = −2.5
ж) −2.1 ⋅ 3.8 = −7.98
з) −1 \(\frac{11}{13}\) ⋅ (−2 \(\frac{7}{16}\)) = −\(\frac{24}{13}\) ⋅ (−\(\frac{39}{16}\)) = \(\frac{24 ⋅ 39}{13 ⋅ 16}\) = \(\frac{3 ⋅ 3}{1 ⋅ 2}\) = \(\frac{9}{2}\) = 4 \(\frac{1}{2}\) = \(\frac{295}{208}\)
и) −0.98 : 1.4 = −0.7
Ответ: а) -9; б) 6,8; в) -41/24; г) 0; д) -3,9; е) -2,5; ж) -7,98; з) 295/208; и) -0,7