robert7248
06.10.2019 •
Mathematics
Barry bought 21 stamps from a hobby shop. he gave 3/7 of them to his sister, how many stamps did he have left?
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Ответ:
Ответ:
2x+y=−2 , x+2y=2xy=9, x+y=6x+2y=4, x−y=−3
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