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Окружающий мир
Окружающий мир
Learning objective
x
=
2
a
−
b
±
b
2
−
4
a
c
1
minute
00
second
+30 s
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Окружающий мир
Learning objective
x
=
2
a
−
b
±
b
2
−
4
a
c
1
minute
00
second
+30 s