Решите уравнения :
а) (х+ 4 целых девять одиннадцатых) - 5 цел. 6 одиннадцатых = 1 цел. 8 одиннадцатых
б) 13 цел. 2 девятых - ( 7 цел. 5 девятых + у ) = 3 цел. 5 девятых
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