Răspuns:
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b) {[(n×9):3]×4}:5-6=2×3
{[(9n)÷3]×4}:15-6=2×3
[(3n)×4]:15-6=6
(3n×4):15-6=6
(12n):15-6=6
12n/15-6=6
(simplifici fractia si iti da)
4n/5-6=6
4n-30=30
4n=30+30
4n=60
n=60:4
n=15
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a+b+c=253
a:b=3=>a=3b
c=3+b
3b+b+3+n=253
5b=253-3
5b=250
b=250:5
b=50
a=3×50
a=150
c=3+50
c=53
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250+250=500
500+55=555
555×4=2220
|V
Notam :
x- varsta fiicei
y- varsta mamei
y=x+22
x+6=(y+6)/3
x+6=(x+22+6)/3
x+6=(x+28)/3
3x+18=x+28
3x-x=28-18
2x=10
=>x=10:2
x=5
y=27
Sper ca te-am ajutat! ❤
