упростите выражения:

1. 5/6(4.2x- 1 1/5y)-5.4(2/9x-1.5)

2. -(a-3.8)+(4.8+а)=

3.(n-5.8)-(4.9+n)=

Ответьте на все я хочу в кс поиграть...​
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