Решите пж системы, сегодня нужно
1) lgx-lgy=2
x-10y=900
2) lgx-lgy=7
lgx+lgy=5
1) lgx-lgy=2
x-10y=900
2) lgx-lgy=7
lgx+lgy=5
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Answers & Comments
100y-10y=900
90y=900
y=10
x=1000
2)
7y^2=5
y^2=5/7
y=+-\sqrt{5/7}
y1=sqrt(5/7), x1=7sqrt(5/7)
y2=-sqrt(5/7), x2=-7sqrt(5/7)