Упростите выражение и найдите его значение 1) (xy-2x+5y)*3+2(2xy+3-6y), если x = 1 целая 2/7, y = - 5/6
2) (3m - 4n) k -m (6n + 5k) - (nk - 6mn) , если m= - 1, k = -3,5 , n = 4
3) 2a (3 - b) - 3b ( a - 2) - 5 (ab + a + b ) , если a = 1,5 , b= -2,6
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