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Ciunguadina2
a fost răspuns

Afla numerele: a, b, c, d . stiind ca:

a+b+c+d=1560
a+100=d
a+d=630
c-d=130

Răspuns :

a+b+c+d=1560
a+100=d
a=d-100
a+d=630
d-100+d=630
d+d=630+100
2d=730
d=730:2
d=365
a=d-100
a=365-100
a=265
c-d=130
c-365=130
c=130+365
c=495
a+b+c+d=1560
265+b+495+365=1560
b=1560-265-495-365
b=435

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