139. Доведіть тотожність: 1)-0,2.(46 - 9) + 1,4b = 0,66 + 1,8; 2) (5а - 3b) - (4 + 5а - 36) = -4; 3) 5 (0,4x -- 0,3) + (0,8 - 0,6x) = 1,4x – 0,7; 4) Зу = 27) 2 (u-1,5) - ву.​
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