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a-I liczba
b-II liczba
a+b=-7,2
a/b=4/5
4/5b+b=7,2
a=4/5b
9/5b=7,2
a=4/5b
b=72/10*5/9
a=4/5b
b=4
a=4/5*(4)=1/5
x÷y=4/5=0.8
x=7.2-y
7.2-y/y=0.8 /*y
7.2-y=0.8y
7.2=0.8y+y
7.2=1.8y /÷1.8
y=4
x+4=7.2
x=7.2-4
x=3.2
spr.4+3.2=7.2
3.2÷4=0.8
x/y=4/5 /y
czyli x=4/5y
podstawiamy
4/5y+y=7,2
9/5y=36/5/razy 5/9
y=4
czyli
x+4=7,2
x=7,2-4
x=3,2
suma
x=y=7,2 czyli 3,2+4=7,2
iloraz
x/y=4/5
3,2=16/5
16/5:4=16/5*1/4=4/5
Odp. Szukanymi cyframi są x=3,2, y=4