Question

Calculează
a) (-3/32)•(-8/9)•(-27/9)
B) ,(-25/18)•49/10•(-4/35)
c) (-5)•(+7)•(-3/5)
d)(-7/9)•(-1)•5/7•(+3)
e) (-1/4)•8•(-1)•(+6)•(-1/12)
f) 7/3•(-19/36)•(-15/14)

Answer 1

a) (-3/32)•(-8/9)•(-27/9) =
(-) × (-) = (+) ; (+) × (- ) = (-)
= 3×8/32×9 × (-27/9) =
= 1/4×3 × (-3) =
= 1/12 × (-3) =
= - 3/12 =
= - 1/4

b) (-25/18)•49/10•(-4/35) =
= -5/18×49/2 × (-4/35) =
= - 245/36 × (-4/35) =
= 7/9

c) (-5)•(+7)•(-3/5) =
= - 35 × (-3/5) =
= - 7 × (-3) =
= 21

d) (-7/9)•(-1)•5/7•(+3) =
= 7/9 × 5/7 × 3 =
= 5 × 3/9 =
= 5/3

e) (-1/4)•8•(-1)•(+6)•(-1/12) =
= - 8/4 × (-1) × (+6) × (-1/12) =
= 2 × 6 × ( - 1/12) =
= 12 × (- 1/12) =
= - 12/12 =
= - 1


f) 7/3•(-19/36)•(-15/14) =
= - 133/108 × ( - 15/14) =
= 133 × 15/ 108 × 14 =
= 1 995/1 512 =
= 665/504