Question

(-1intreg si 2/3-4intreg si5/6-7intreg si 8/9)×(-18/10)

Answer 1

(-1 2/3-4 5/6-7 8/9)x(-18/10)=(-5/3-29/6-71/9)x(-18/10)= (in prima paranteza numitor comun 18) =[(-30-87-142)/18]x(-18/10)=(se simplifica 18)=259/10

Answer 2

→ introduc intregii in fractie

1 intreg si 2 / 3 = ( 1 x 3 + 2 ) / 3 = 5 / 3

4 intregi si 5 / 6 = ( 4 x 6 + 5 ) / 6 = 29 / 6

7 intregi si 8 / 9 = ( 7 x 9 + 8 ) / 9 = 71 / 9

( - 5 / 3 - 29 / 6 - 71 / 9 ) × ( - 18 / 10 ) =

→ cmmmc al numitorilor ( 3; 6 si 9 ) = 18; aduc fractiile la acelasi numitor

( - 30 / 18 - 87 / 18 - 142 / 18 ) × ( - 18 / 10 ) =

= ( - 259 / 18 ) × ( - 18 / 10 ) = 259 / 10 = 25 intregi si 4 / 10 = 25,9