1. Раскройте скобки:, а) 3( 2а + в - 8с)=, б) - 4 ( -х +3у - 4 т)=, в) -2а(5+3в-4-2с) =, 2.Упростите выражение:, а) 2(8,5 - х) - ( 7,8 - 5х)=
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