№249. упростите выражение:
а) 15а*4;
б)3b*12;
в)17a*5b;
г)11a*7b;
д)c*18*d;
е)x*9*4*y.
а) 15а*4;
б)3b*12;
в)17a*5b;
г)11a*7b;
д)c*18*d;
е)x*9*4*y.
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Б) 36b
85ab
77ab
18cd
36xy