Question

1. Obliicz 9/14 różnicy liczby 7 5/9, 4 5/6. Odp. 1 3/4 2. Do 8/15 liczby 9/16 dodaj 4/9 liczby 3/10. Odp. 13/30 3. Oblicz 8/9 sumy liczb: 1 3/4, 2 2/3, 3 5/6. odp. 7 1/3 4. Oblicz średnią liczb: 3 5/6 i 5 1/4. Odp. 4 13/24

Answer 1

w załączniku

Answer 2

z.1

( 9/14)*( 7  5/9 - 4 5/6 ) = ( 9/14)*( 7  10/18 - 4  15/18 ) = ( 9/14)*( 6 28/18 - 4 15/18 ) = ( 9/14)*(2  13/18) = ( 9/14)*( 49/18) = ( 1/14)*(49/2) = 49/28 =

= 1  21/28 =  1  3/4

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z.2

( 8/15)*(9/16 ) + (4/9) *(3/10) = (1/15)*(9/2) + (2/9)*(3/5) = 9/30 + 6/45 =

= 27/90 + 12/90 = 39/90 = 13/30

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z.3

( 8/9)*( 1  3/4 + 2  2/3 + 3  5/6) = ( 8/9)*(1  9/12 + 2  8/12 + 3  10/12) =

= ( 8/9) * (6  27/12) = ( 8/9) *( 8  3/12) = ( 8/9)*( 8  1/4) = ( 8/9)*(33/4) =

= (2/9)*33 = 66/9 = 22/3 = 7  1/3

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z.4

[ 3  5/6  + 5  1/4 ] : 2 = [ 3  10/12 + 5  3/12 ] : 2 = ( 8  13/12) : 2 =

= ( 9  1/12 ) : 2 = ( 109/12) : 2 = 109/24 =  4  13/24

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