Question

Calculeaza a] 4 supra 5 x 15 supra 8; 7 supra 10 x 20 supra 21 ; c] 7 supra 10 x 20 supra21 ;c] 32 supra 48 x 16 supra 32 x 16 supra 32 ; d] 11supra 12 x 24 supra33; e] 33 supra 44 x 77 supra 88 x 55 supra22; f] 1313 supra3131x 31 supra13.

Answer 1

Răspuns

Explicație pas cu pas:

a)  4 / 5 x 15 / 8 = ( 4 / 8 ) x ( 15 / 5 ) = 3 / 2

b)  7 / 10  x 20 / 21 = ( 7 / 21 ) x ( 20 / 10 ) = 2 / 3

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c )  32 / 48  x 16 / 32 = ( 32 / 32 ) x ( 16 / 48 ) = 1 / 3

     32 / 48  x 16 / 32  x 16 / 32 = 1 / 3  x 16 / 32 =1 / 3 x 1 / 2 = 1 / 6

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d) 11 / 12   x 24 / 33 = ( 11 / 33 ) x ( 24 / 12 ) = 2 / 3

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e)   (33 / 44) x (77 / 88) x ( 55 / 22 ) =

     am simplificat fiecare fractie cu 11

= ( 3 / 4  ) x ( 7 / 8 ) x ( 5 / 2 ) =

= ( 3 x 7 x 5 ) / ( 4 x 8 x 2 ) =

= 105 / 64

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f)   ( 1 313 / 3131 )  x (31 / 13 ) = 101 / 101 = 1

= ( 1313 / 13 )  x ( 31 / 3131 ) = 101 / 101