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calculati: 1intreg 4pe5:(3pe4×8pe21+1)-4pe9.

Răspuns :

1 4 / 5 : ( 3 / 4 x 8 / 21 + 1 ) - 4 / 9 =

= 9 / 5 : ( 2 / 7 + 1 ) - 4 / 9

= 9 / 5 : ( 2 / 7 + 7 / 7 ) - 4 / 9

= 9 / 5 : 9 / 7 - 4 / 9

= 9 / 5 x 7 / 9 - 4 / 9

= 7 / 5 - 4 / 9

= 43 / 45