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a fost răspuns

calculeaza:7/3 - 1/2*[21/10 + 3/10 :(1/2 - 1/3 )]+11/30

Răspuns :

EagleEyes
7/3 - 1/2*[21/10 + 3/10 :(1/2 - 1/3 )]+11/30 =
= 7/3 - 1/2 * ( 21/10 + 3/10 : 1/6 ) + 11/30 =
= 7/3 - 1/2 * ( 21/10 + 3/10 * 6 ) + 11/30 =
= 7/3 - 1/2 * ( 21/10 + 3/5 * 3 ) + 11/30 =
= 7/3 - 1/2 * (21/10 + 9/5 ) + 11/30 =
= 7/3 - 1/2 * 39/10 + 11/30 =
= 7/3 - 39/20 + 11/30 =
= ( 140 - 117 - 22 )/60 =
= 45/60 = 3/4 

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