Răspuns:
Explicație pas cu pas:
2)
a)
a/m=7/5
a/m=b/n=c/n=7/5
a= 7m/5 , b= 7n/5 , c= 7p/5
(a+b+c) / (m+n+p) = ( 7m/5+7n/5+7p/5)/ (m+n+p)
= 7/5* (m+n+p) / (m+n+p)= 7/5
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b)
a= 2m/9 , b= 2n/9 ,c=2p/9
2/9*(m+n+p) / ( m+n+p)= 2/9
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c)
a/m=b/n=c/p=3/8
a= 3m/8 , b= 3n/8 ,c=3p/8
3/8*( m+n+p) /( m+n+p) = 3/8
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3)
a)
a/x=b/y=c/z= (a+b+c)/x+y+z) =4/5
a/x=4/5
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b)
b/y= 4/5
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c)
z/c=4/5
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5)
x/4=y/6= z/8=5/9
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x/4=5/9
9x=5*4
9x=20
x=20/9
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y/6=5/9
9y= 5*6
9y=30
y= 30/9
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z/8=5/9
9z= 5*8
9z=40
z= 40/9
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x+y+z= 20/9+30/9+40/9=90/9 =10
