Question

1,6*(-4,5)+(1 7/8)*1 1/3- 1 2/3:(-3 1/3)

Answer 1

$1,6*(-4,5)+1 frac{7}{8} *1 frac{1}{3} -1 frac{2}{3}:(-3 frac{1}{3}) = \ = -7,2 + frac{15}{8} * frac{4}{3} + frac{5}{3} : frac{10}{3} = \ =-7,2+ frac{15*4}{8*3} + frac{5*3}{3*10} =-7,2+ frac{60}{24} + frac{15}{30} = \ =-7,2+ frac{5}{2} + frac{1}{2} = -7,2+ frac{6}{2} =-7,2+3=-4,2$

Answer 2

1,6 * (-4,5) + (1 7/8) * 1 1/3 - 1 2/3 : (-3 1/3) = - 4,2 

1) 1,6 * (-4,5) = - 7,2
2) 1 7/8 * 1 1/3 = 15/8 * 4/3 = 5/2 = 2 целых 1/2 = 2,5
3) 1 2/3 : (-3 1/3) = 5/3 : (-10/3) = 5/3 * (-3/10) = - 1/2 = - 0,5
4) -7,2 + 2,5 = - 4,7
5) - 4,7 - (-0,5) = - 4,7 + 0,5 = - 4,2  

Пояснения:
1 целая 7/8 = (1*8+7)/8 = 15/8
1 целая 1/3 = (1*3+1)/3 = 4/3
1 целая 2/3 = (1*3+2)/3 = 5/3
3 целых 1/3 = (3*3+1)/3 = 10/3