Question

rezolvaţi problema mea.Calculaţi vă rog.
a)76÷(-19)=
b) -56÷(-8)=
c) -0,81÷1,8=
d) -7 4/5:(1 11/15)​

Answer 1

Răspuns:

Explicație pas cu pas:

a)   76 : ( - 19 ) = - 4

b)  - 56 : ( - 8 ) = + 7

c)  - 0,81 : 1,8 = - ( 81/100) : ( 18/10) = - ( 81/100) × ( 10/18) =

=  - (81/18) ×(10/100) =

= - (81:9)/(18:9) × 1/10 =

= - 9/(2×10) =

= - 9/20 =

= - 0,45

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d)

->  introduc intregii in fractie

7 intregi si 4/5 = (7×5+4)/5 = 39/5

1 intreg si 11/15 = (1×15+11)/15 = 26/15

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- 39/5 : ( 26/15 ) = - 4 intregi si 1/2 = - 4,5

= (- 39/5 ) × (15/26) =

= - (39/26) × (15/5) =

= - (39:13)/(26:13) × 3 =

= - (3×3)/2 =

= - 9/2 =

= - 4 intregi si 1/2 =

= - 4,5