Question

Найдите значение выражений. 1. (-12,4+8,9)*1 3/7 2. (2 3/8-1 5/6): (- 1 5/8)

Answer 1

1) (-12,4 + 8,9) * 1 3/7 =

= -3,5 * 10/7 = -35/10 * 10/7 = -5

ответ: -5

2) (2 3/8 - 1 5/6) : (-1 5/8) =

= (19/8 - 11/6) : (-13/8) =

= (57/24 - 44/24) * (-8/13) =

= 13/24 * (-8/13) = -1/3

ответ: -1/3

Answer 2

Пошаговое объяснение:

1)

$(-12,4+8,9)* 1\frac{3}{7} =- 3, 5 * 1\frac{3}{7} =- \frac{35}{10} * \frac{10}{7} = -\frac{35*10}{10*7 } = - \frac{5*1}{1*1} =-5.$

2)

$( 2\frac{3}{8} -1\frac{5}{6} ): (-1\frac{5}{8} ) =( 2\frac{9}{24} -1\frac{20}{24} ):(-\frac{13}{8} ) =( 1\frac{33}{24} -1\frac{20}{24} )*( -\frac{8}{13} ) =\\\\=\frac{13}{24} *( -\frac{8}{13} )=-\frac{13*8}{24*13} =-\frac{1*1}{3*1} =-\frac{1}{3} .$