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2014-05-09T15:14:50+03:00
A+b=80
a:b=7,8
a=7b+8

7b+8+b=80
8b=80-8
8b=72
b=72:8
b=9

a=9*7+8
a=63+8
a=71
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  • Utilizator Brainly
2014-05-09T15:20:14+03:00
X+z=80
x:z=7,8
x=7z+8

7z+8+z=80
8z=80-8
8z=72
z=72:8
z=9

x=9*7+8
x=63+8
x=71