а) -9x+5y
б) 10a+5
2) 10a+6+5,5a-8= -4,5а-2 при а= - · -2= -1-2= -3
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а) -9x+5y
б) 10a+5
2) 10a+6+5,5a-8= -4,5а-2 при а= - · -2= -1-2= -3