-2,375×(-2 4/7)×3,2×(-7/18)×8/19=помогите плизочень надо.

Question

-2,375×(-2 4/7)×3,2×(-7/18)×8/19=
помогите плиз
очень надо.

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Answer 1

-2,375×(-2 4/7)×3,2×(-7/18)×8/19 = (2 3/8)• (2 4/7)• 3 1/5• (-7/18)• 8/19= 19/8• 18/7• 16/5 • (-7/18)• 8/19 = 1/1• 1/1• 16/5• (-1/1)• 1/1= -16/5= -3 1/5= -3,2. ______ ____________ Сократились сразу 19/8 и 8/19; и 18/7 и (-7/18). ________ -2,375= -2 375/1000= - 2 3/8; ____ 3,2= 3 2/10= 3 1/5.

Answer 2

1) -2,375 * -2 4/7 = 2 3/8 * 2 4/7 = 19/8 * 18/7 = 19/4 * 9/7 = 171/28

2) 171/28 * 3,2 = 171/28 * 16/5 = 171/7 * 4/5 = 684/35

3) 684/35 * -7/18 = - 38/5

4) -38/5 * 8/19 = - 16/5 = -3 1/5 = -3,2