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ycilko
@ycilko
March 2022
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Решите систему уравнений и уравнение
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mikael2
Verified answer
X+y=7
lgx+lgy=1 → lgxy=1→ xy=10
x+10/x=7 x²-7x+10=0 по Виету x1=2 y1=7-2=5 x2=5 y2=2
ответ В)
log2 log3 (tgx) =1
log3 (tgx)=2
tgx=9
x=arctg9+πk k∈Z ответ С)
2 votes
Thanks 2
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Answers & Comments
Verified answer
X+y=7lgx+lgy=1 → lgxy=1→ xy=10
x+10/x=7 x²-7x+10=0 по Виету x1=2 y1=7-2=5 x2=5 y2=2
ответ В)
log2 log3 (tgx) =1
log3 (tgx)=2
tgx=9
x=arctg9+πk k∈Z ответ С)