Упростите выражение и найдите его значение 1)6а+4b+3b-8а   при а=1; b=0,5
2) 7,4х-2,7у+6,3у-9,6х при х=-5; у=2
3) 1/2а+3/8b-2/3а-b при а=3 b=4
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