Упростите выражения: 1) 3,9a-2,81b-5,1a=4,9b
2)1.3/4x-3.7/11y+2.1/4x-5.4/11
3)-1.5/12m-5/7n-7/12m-2/7n
1.3/4 и т.д. это обыкновенная дробь
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