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(1/3+1/3·0,75):(-18/30)=
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Răspuns :

(1/3 + 1/3× 75/100): (-18/30) =
= (1/3 + 75/ 300) × (-30/18)=
= (100+75)/300 × (-30/18) =
= 175/300× (-30/18)=
= - 175/180 =
= - 35/36
=(1/3+1/3 x 3/4) : (-18/30)
=(1/3+3/12)(-30/18)
=7/12 x -30/18
= - 35/36