Раскройте скобки :
1) 3(а-1,7)
2)-3(1,6+у)
3)-4(х+у)
4)х-(у+2)
5)9-(а+b+c)
6)m+(8+n-k)
7)x+(y-z+8)

буду ну ооочень благодарна! Даю 100 баллов
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