а)5х+8х при х=13
б)39х-5х-4х+28 при х=3; х=5
а)5*13+8*13=65+104=169 б)39*3-5*3-4*3+28=117-15-12+28=118 2реш.)39*5-5*5-4*5+28=195-25-20+28=178
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а)5*13+8*13=65+104=169 б)39*3-5*3-4*3+28=117-15-12+28=118 2реш.)39*5-5*5-4*5+28=195-25-20+28=178