ex 23 si 24 va rog dau 50 puncte .
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23.
a)3y=4x-4y ; 7y=4x => x/y=7/4
b)73y=30x+15y ; 58y=30x =>x/y=58/30=29/15
c)18y=12x-4y ; 22y=12x =>x/y=22/12=11/6
d)7x-7y=3x+3y ; 4x=10y =>x/y=10/4=5/2
e)5x+10y=17x ; 10y=12x =>x/y=10/12=5/6
f)34x+17y=13x+26y ; 21x=9y =>x/y=9/21=3/7
g)32x-16y=11x+11y ; 21x=27y =>x/y=27/21=9/7
h)9x=3x+8y ; 6x=8y =>x/y=8/6=4/3
24.
x/7=y/3=z/1=k
x=7k =>8x=56k
y=3k =>5y=15k
z=k
56k-15k=2
41k=2 =>k=2/41
x=14/41
y=6/41
z=2/41
xyz=(14×6×2)/41^3=168/68921
a)3y=4x-4y ; 7y=4x => x/y=7/4
b)73y=30x+15y ; 58y=30x =>x/y=58/30=29/15
c)18y=12x-4y ; 22y=12x =>x/y=22/12=11/6
d)7x-7y=3x+3y ; 4x=10y =>x/y=10/4=5/2
e)5x+10y=17x ; 10y=12x =>x/y=10/12=5/6
f)34x+17y=13x+26y ; 21x=9y =>x/y=9/21=3/7
g)32x-16y=11x+11y ; 21x=27y =>x/y=27/21=9/7
h)9x=3x+8y ; 6x=8y =>x/y=8/6=4/3
24.
x/7=y/3=z/1=k
x=7k =>8x=56k
y=3k =>5y=15k
z=k
56k-15k=2
41k=2 =>k=2/41
x=14/41
y=6/41
z=2/41
xyz=(14×6×2)/41^3=168/68921
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Explicație pas cu pas:
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