3 * (0,16 - 62/75) * (4,75 + 7 1/2) = (-24,5)
1) 0,16 - 62/75 = 4/25 - 62/75 = 12/75 - 62/75 = - 50/75 = (-2/3)
2) 4,75 + 7 1/2 = 4,75 + 7,5 = 12,25
3) 3 * (-2/3) = (-2)
4) (-2) * 12,25 = (-24,5)
Пояснения:
0,16 = 16/100 = (16:4)/(100:4) = 4/25 - сократили на 4
4/25 = (4*3)/(25*3) = 12/75 - доп.множ. 3
1/2 = (1*5)/(2*5) = 5/10 = 0,5 в десятичных дробях