Ответы на вопрос:
=( 2(4/7) + 3(1/7) - ( 1(3/7) + 2 (5/7) ) = 5 ( 5/7 ) - 3 (8/7) = 5 (5/7 ) - 4 (1/7) = = 1 ( 4/7 )
2(а+2) - 10 = 6(3-а)2а + 4 - 10 = 18 - 6а2а - 6 = 18 - 6а2а + 6а = 18 + 68а = 24а = 24 : 8а = 3проверка: 2(3+2) - 10 = 6(3-3) 2*5 - 10 = 6*010 - 10 = 00 = 03(2у-1) + 6(3у-4) = 83 + 5(у-3)6y - 3 + 18y - 24 = 83 + 5y - 1524y - 27 = 5y + 6824y - 5y = 68 + 2719y = 95y = 95 : 19y = 5проверка: 3(2*5-1) + 6(3*5-4) = 83 + 5(5-3) 3(10-1) + 6(15-4) = 83 + 5*2 3 * 9 + 6 * 11 = 83 + 10 27 + 66 = 93 93 = 93
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