Ответ:

Пошаговое объяснение:

а) (-1.9)*4^2÷3.8=

= -1.9*16÷3.8=

= -30.4÷3.8=

= -8

б) (-3 1/9)*7/15÷1 1/27=

= -28/9*7/15÷11/27=

= -196/135÷11/27=

= -5292/1485=

= -1764/495=

= -588/165=

= -196/55=

= -3 31/55

в) (10-5 2/3-8.5)÷(-4 2/9+5 5/18)=

=(10/1-17/3-17/2)÷(-38/9+95/18)=

=(60/6-34/6-51/6)÷(-76/18+95/18)=

= -25/6÷19/18=

= -450/114=

= -225/57=

= -75/19=

= -3 18/19