Ru5829
12.03.2020 15:51

Underline the most
suitable verb form in each sentence.
1 did you see / have you seen my bag anywhere? i can't find it.
2 larry is writing, has been writing / has written his novel for the last two years.
3 from the minute he got up this morning gary asked / has asked / has been asking
silly questions!
4 have you given / did you give helen my message when you have seen / saw her?
5 sorry, could you say that again? i didn't listen / haven't listened / haven't been
listening to you.
6 the police think that they found / have found your wallet, so call this number.
7 did you two meet / have you two met before? eric, this is amanda.
3 did you meet / have you met anyone interesting at the party?
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Ответ:
Yrikrylko
14.09.2019 10:10
Mвещества=(20/100% )*400=80г m раствора=400+100=500г  w=(80/500)*100%=16 %
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