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ответ:
3.
1) no we aren`t
2) yes he does
3)yes she has
4) no i don`t
5)no it hasen`t
6) yes they are
объяснение:
1) are we friends? no, we aren`t
2) does petros have a close friends? yes, petros have a close friends
3)has she got the cat? yes, she has got the cat
4)do you have a sister? no, i haven`t
5) has it got a name? no it hasn`t
2na+o2=na2o2.
na2o2+ 2na=2na2o.
2na+2h2o=2naoh+h2.
h2so4+2naoh=na2so4+2h2o.
nacl+agno3=nano3+agcl или 8na + 10hno3(конц) = 8 nano3 + n2o + 5 h2o.
2mg + o2 => 2mgo
fecl + cl2 => fecl3
mgco3=> mgo + co2
2na+2naoh=2na2o+h2
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