ну вроде ответ такой -8sin2x
А) = - 3,7 + (1 2/5 - (- 3/5) = - 3,7 + (1 2/5 + 3/5) = - 3,7 + 2 = - 1 ,7
б) = (- 1/14 +4/14) - (- 0,57 - 0,43) - 5/21 = 3/14 - (- 1) - 5/21 = 3/14 + 1 - 5/21 = 1 3/14 - 5/21 = 1 9/42 - 10/42 = 41/42
На 30 км в час.........................................................................................................................................................................................................................................................................................................................
34*23+26*25-25*14=25*(34+26-14)=25*46=1 150