Question

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Answer 1

Răspuns:

1) 2·[ 1+1/2·(2+1/4:0,3125)]=

   2·[ 1+1/2·(2+1/4:3125/10000)]=

   2·[ 1+1/2·(2+1/4·10000/3125)]=

   2·[ 1+1/2·(2+4/5)]=

   2·[ 1+1/2·(10/5+4/5)]=

    2·(1+1/2·14/5)=2·(1+7/5)=2·(5/5+7/5)=2·12/5=24/5=4,8

2)Fie x= suma a patru dintre cele 10 numere⇒ Ma=x/4=1,101⇒x=1,101·4=4,404

Fie y = suma celorlalte 6 numere rămase⇒ Ma=(x+y)/10= ((4,404+y)/10= 23,61⇒ 4,404+y= 10·23,61⇒y=236,1-4,404⇒y=231,696

Ma = y/6= 231,696/6=38,616

3)  l= 2/3·L

    h= 3/4·l=3/4·2/3·L=1/2·L

 l+L+h=6,5⇒ 2/3·L+L+1/2·L=6,5⇒ 4L+6L+3L=39⇒ 13L=39⇒L=39/13=3 m

l=2/3·3=2 m

h=1/2·3=1,5 m

V= l·L·h= 2·3·1,5=9 m³=9000dm³=9000 litri

Explicație pas cu pas: